Friday, September 4, 2020

Four Star Motorsports-Pricing Essay Example

Four Star Motorsports-Pricing Paper Deliverable 3-Four Star Motorsports Course: 07360, Pricing Strategy - Student: Jing Wang, Yu-Wen Chu * Using relapse, gauge the interest bends for each sort of tire in each kind of interest season (low, medium, high). I prescribe that you use Excel to do the relapses. (Note: interest for the two sizes of tire are free from each other). Yokohama Winter Rally Tire Demand Curve | WR 26 155/65R13| WR 26 185/65R14| Normal Demand| Q=106. 4-0. 544P| Q=104. 8-0. 448P| High Demand| Q=86. 28571-0. 33143P| Q=94. 714-0. 3314P| Low Demand| Q=155. 2-0. 704P| Q=132. 8-0. 704*P| * What is the ideal â€Å"one-price† strategy for Sprongl’s rally tires on the off chance that he stays with his â€Å"base prices† for the whole year? (Expect he will likely have no remaining stock and to amplify all out income). Tire Type| WR 26155/65R13| WR 26185/65R14| Inventory| 280| 265| | Price| $150. 82| 159. 8190703| | Period 1| 49. 02| 20. 29| Period 2| 24. 35| 33. 20| Period 3| 36. 30| 41. 61| Period 4| 24. 35| 33. 20| Period 5| 36. 30| 41. 61| Period 6| 24. 35| 33. 20| Period 7| 36. 30| 41. 61| Period 8| 49. 2| 20. 29| | Demand| $280. 00| 265. 00| | Revenue| $42,229. 98| $42,352. 05| * If Sprongl chooses for use â€Å"dynamic pricing† by changing costs for each tire in each season, what are the ideal costs if his evaluated request bends are assessed accurately? (Note: there is no worldwide ideal answer for this in Solver yet a few â€Å"local optima† that are comparative. I suggest that you figure the ideal valuing for each tire independently, and afterward aggregate the all out income from each). * What are the advantages and disadvantages of fixed and dynamic valuing in this circumstance? Clarify your thinking. Fixed valuing: Pros: 1. Fixed estimating sets up ideal â€Å"one-price† strategy for Sprongl’s two diverse meeting tires. There will be neither wrangling nor rivalry from different period’s cost. 2. There will be no exchange so Four Star Sports can without much of a stretch foresee and screen the stock. Cons: Resulting either in cash left on the table or lost deals Dynamic Pricing: Pros: http://news. wustl. edu/news/Pages/4382. aspx http://smallbusiness. chron. com/dynamic-evaluating technique 5117. html http://personnel. insead. du/popescu/ioana/Papers/PopescuWu. pdf http://www. meiss. com/download/RM-Maglaras-Meissner. pdf 1. Dynamic estimating technique empowers Four Star Motorsports augment the net revenue and boost the income from *** to *** Cons: 2. The dynamic valuing needs far reaching information and testing to function admirably, for this situation, we just had extremely restricted information to locate our dynamic evaluating tech nique, which probably won't mirror the genuine interest bend. 3. It additionally requires progresses in retail location innovation and broad reception of electronic names for stock administration. We will compose a custom paper test on Four Star Motorsports-Pricing explicitly for you for just $16.38 $13.9/page Request now We will compose a custom exposition test on Four Star Motorsports-Pricing explicitly for you FOR ONLY $16.38 $13.9/page Recruit Writer We will compose a custom exposition test on Four Star Motorsports-Pricing explicitly for you FOR ONLY $16.38 $13.9/page Recruit Writer This may build the expense significantly. Considering Four Star Sports is a privately-owned company, and their income may not be sufficiently high to help this cost on new innovation. 4. Clients may feel out of line that similar items are charged at various costs. 5. The dynamic evaluating may prompt exchange, clients with significant expense versatility may move to the low value time frame to buy the convention tires; On the other hand some shrewd individuals may buy more than they need during the low value time frame at that point to sell at significant expense period. These will change the interest bend and the opposition condition drastically and impact the stock administration. 6. Dynamic valuing technique suits visit bought shopper merchandise showcase better, on the grounds that the customers’ buy choices are intensely affected by the past watched cost. For this situation, client may not buy rally tires all the time, subsequently the history cost has less effect on their dynamic.

Wednesday, August 26, 2020

E-commerce Essay Example | Topics and Well Written Essays - 1250 words

Internet business - Essay Example In this article, the writer guarantees that E-trade happens to be the electronic business, it's a type of business wherein the offer of items and options or the two organizations completed about devices including the Web and other home Laptop or PC systems to additionally improve institutional fundamental execution. The improvement of internet business has changed organization across countries. From when it turned out discharged, organizations have taken increase it to, upgrade exposition online assistance items, improve their commercial center offer, extend gainfulness and scale down shipment time. Web based business was just non-existent in many parts inside the planet. In the 21st century, prompt improvement of data innovation and the quick increment in data trade have assisted with carrying new drives and imaginative plans to the total society. The wide appropriation of it by the network has brought about incredible changes. These are changes which affect how we speak with one an other, how precisely we arrange our every day exercises, how we instruct the more youthful age, and how we maintain the business venture. The turn of events and broad appropriation of it, PC arrange, and the Internet have modified the strategy for activity of a few organizations, and simultaneously have brought along phenomenal work at home chances. Organizations are presently in a situation to direct endeavors across land limits. This is perhaps the best papers about E-business. Pick up the pace and get this most elevated A potential work just now!... Be that as it may, this area is profoundly serious in light of the fact that the boundaries or expenses of entering the web e-tail advertise are not many, which caused numerous little e-tail amasses come up on the web. Turning out to be productive and enduring is hard for e-rears without brand name or experience since they face the test of separating the business from the current stores or sites. Web based business new companies that plan to gain cash by offering content face troubles except if they have one of a kind sources other substance suppliers can't access since the conventional substance suppliers direct the majority of this business classification. Too, rivalry among online exchange merchants has been savage over the most recent couple of years with new participants like E*Trade, Datek and Schwab offering all the more engaging proposals to shoppers. Market prospect for online market makers is tremendous for firms with money related assets and showcasing plans for drawing in sufficient purchasers and dealers to the commercial center. In this manner, new firms craving to make a market need forceful marking and mindfulness projects to draw adequate clients like huge online firms like Amazon that influence enormous client base and start closeout. The upside of B2C is that it bases on respectable physical frameworks, information on purchaser inclinations, culture and language, brand acknowledgment and trust (â€Å"E-trade Business Models†¦Ã¢â‚¬ , 2009; Nemcova, 2011). The vast majority of the income in web based business include business-to-business (B2B) despite the fact that most open consideration center around B2C since the greater part of B2B is concealed by normal buyer. E-merchant organizations like W.W. Grainger gracefully items and administrations to singular organizations along these lines e-wholesalers are claimed by an organization that tries to serve different clients. More items and

Saturday, August 22, 2020

Lawinternational financial market Essay Example | Topics and Well Written Essays - 4000 words

Lawinternational money related market - Essay Example It would not be right to state that in the primary beginning period of this internationalization of the money related market, the principle issues that were looked by those included are more observable than the compensation it provided for all. In the event that we truly come to talk about the genuine picture, at that point one indispensable character of the market at that point was the controls and lethargic expansion in Europe during the year 1990 and even some time after that .The Year 1997 and 1998 denoted the beginning of the Asian dilemma. Notwithstanding these happenings which approached as difficulties to the global money related markets and the gatherings included in that. The genuine embodiment of the universal exchange, then again stretched at a quick speed, plateful to power consistent quick financial improvement in bunches of best in class markets and furthermore developing nations. By the side of the indistinguishable second in time, the advancements in that of worldwide account incorporate nothing that can't be considered as anything lesser than being shy of vanguard. Alongside the expansion in the across outskirt appraisal of monetary exchanges. The expanding pattern in the worldwide market has taken up a swifter pace at a quick yet important way. Likewise the business sectors have advanced into them the qualities of momentous new hazard move instruments. These Risk move Instruments likewise incorporate the different various types of Derivative protections. Alongside these tag along the novel money related es tablishments. Since the time the start of the year 2002, the repayment of this eliminate of globalization has go to be further noticeable. Universal heightening has with assurance surpassed understanding possibility, and furthermore it has been exceptionally unhinged. The rise and advancement of brand new hazard move advertises those are subsidiary protections has helped the way toward spreading hazard furthermore to a great extent alongside valuable exactness. This, financial specialists are equipped for conspiring their hazard profile with an extraordinary arrangement predominant adequacy than before. Just if triumphant, these progressions ought to have the option to encourage the ascending of the worldwide increase bringing about creation the economy a more ought to have assisted with raising worldwide development and to have made the economy increasingly versatile just as increasingly graceful. To be in no uncertainty, the monetary improvement and internationalization additionally tag's along heaps of difficulties inside them. These have additionally supported the improvement of the undertakings of regulatory and tyrant controls that are progressively viewed as diverse. They

Hand Sanitizers vs. Soap and Water

Hand Sanitizers versus Cleanser and Water Antibacterial hand sanitizers are showcased to people in general as a viable method to wash ones hands when customary cleanser and water are not accessible. These waterless items are especially well known with guardians of little kids. Makers of hand sanitizers guarantee that the sanitizers execute 99.9 percent of germs. Since you normally use hand sanitizers to wash down your hands, the supposition that will be that 99.9 percent of hurtful germs are slaughtered by the sanitizers. Research examines recommend this isn't the situation. How Do Hand Sanitizers Work? Hand sanitizers work by stripping ceaselessly the external layer of oil on the skin. This generally forestalls microbes present in the body from rising to the top of the hand. Nonetheless, these microorganisms that are typically present in the body are commonly not the sorts of microscopic organisms that will make us wiped out. In an audit of the examination, Barbara Almanza, a partner educator at Purdue University who trains safe sanitation practices to laborers, reached a fascinating resolution. She takes note of that the exploration shows that hand sanitizers don't altogether lessen the quantity of microorganisms on the hand and sometimes may conceivably build the measure of microbes. So the inquiry emerges, by what method can the makers make the 99.9 percent guarantee? In what manner Can Manufacturers Make the 99.9 Percent Claim? The makers of the items test the items on microscopic organisms spoiled lifeless surfaces, subsequently they can infer the cases of 99.9 percent of microbes slaughtered. On the off chance that the items were completely tried on hands, there would no uncertainty be various outcomes. Since there is innate multifaceted nature in the human hand, testing hands would be increasingly troublesome. Utilizing surfaces with controlled factors is a simpler method to get some kind of consistency in the outcomes. In any case, as we are generally mindful, regular day to day existence isn't as steady. Hand Sanitizer versus Hand Soap and Water Strikingly enough, the Food and Drug Administration, with respect to guidelines concerning legitimate methodology for food administrations, suggests that hand sanitizers not be utilized instead of hand cleanser and water however just as an extra. In like manner, Almanza prescribes that to appropriately clean the hands, cleanser and water ought to be utilized during hand washing. A hand sanitizer can not and ought not replace legitimate purging methodology with cleanser and water. Hand sanitizers can be a helpful elective when the choice of utilizing cleanser and water isn't accessible. A liquor based sanitizer that contains at any rate 60% liquor ought to be utilized to guarantee that germs are murdered. Since hand sanitizers dont expel soil and oils on hands, it is ideal to wipe your hands with a towel or napkin before applying the sanitizer. Shouldn't something be said about Antibacterial Soaps? Research on the utilization of buyer antibacterial cleansers has indicated that plain cleansers are similarly as compelling as antibacterial cleansers in diminishing microorganisms related diseases. Indeed, utilizing buyer antibacterial cleanser items may increment bacterial protection from anti-infection agents in certain microorganisms. These ends just apply to buyer antibacterial cleansers and not to those utilized in medical clinics or other clinical regions. Different examinations propose that ultra-clean situations and the determined utilization of antibacterial cleansers and hand sanitizers may hinder legitimate resistant framework advancement in youngsters. This is on the grounds that provocative frameworks require more prominent presentation to normal germs for legitimate turn of events. In September 2016, the U.S. Food and Drug Administration restricted the promoting of over-the-counter antibacterial items that contain a few fixings including triclosan and triclocarban. Triclosan in antibacterial cleansers and different items has been connected to the advancement of specific ailments. More on Hand Sanitizers versus Cleanser and Water Hand Sanitizers No Substitute for Soap and Water - Purdue NewsTop Five Reasons to Wash Your Hands

Friday, August 21, 2020

10 Deliberately Misspelled Words

10 Deliberately Misspelled Words 10 Deliberately Misspelled Words 10 Deliberately Misspelled Words By Maeve Maddox On the off chance that every English speaker left school having aced English spelling shows, the intentional incorrect spellings found in film titles and different items probably won't trouble me as much as they do. All things considered, I fear the impact of the tireless displaying of mistaken spellings in the commercial center. Here are ten of these conscious incorrect spellings. 1. Incorrect spelling: Biutiful Right: Beautiful Biutiful is the title of a 2010 film featuring Javier Bardem. The discourse is in Spanish with English captions, however biutiful isn’t a right spelling in Spanish either. 2. Incorrect spelling: sez Right: says Simon Sez is a 1999 satire featuring Dennis Rodman. 3. Incorrect spelling: inglourious Right: offensive 4. Incorrect spelling: basterds Right: rats Executive Quinton Tarantino was asked more than once to clarify for what good reason he chose to incorrectly spell the title of his 2009 film as Inglourious Basterds. On one event, he called the incorrect spelling â€Å"a Basquiat-esque touch.† On the David Letterman Show, he said the incorrectly spelled title â€Å"is a Quentin Tarantino spelling.† Effectively spelled, Inglorious Bastards is the English title of a 1978 Italian film coordinated by Enzo G. Castellari. The Italian title is Quel maledetto treno blindato, â€Å"That Damned Armored Train.† Note: Jean-Michel Basquiat was an American craftsman who regularly incorrectly spelled words in his spray painting esque drawings. 5. Incorrect spelling: happyness Right: bliss The Pursuit of Happyness is a 2006 film featuring Will Smith. The incorrect spelling in the title reproduces an incorrectly spelled day-care sign. This title is particularly malevolent on the grounds that it strengthens what is now a typical incorrect spelling. 6. Incorrect spelling: genisys Right: beginning The 2015 portion of the Terminator films utilizes this incorrect spelling as its title. 7. Incorrect spelling: sematary Right: burial ground The 1989 film Pet Sematary depends on Stephen King’s 1983 novel of a similar name. The incorrect spelling in the title gets from a sign lettered by kids. Like satisfaction, burial ground is an oftentimes incorrectly spelled word. 8. Incorrect spelling: steemer Right: liner An early steam-impelled car fabricated by the Stanley Motor Carriage Company (1902-1924) was known as â€Å"the Stanley Steamer.† A floor covering cleaning organization established in 1947 received the name â€Å"Stanley Steemer† as a play on the notable name for the vehicle; the organization cleans rugs with a procedure alluded to as â€Å"steam cleaning.† 9. Incorrect spelling: light Right: light Different organizations utilize this spelling for items. Two models are Miller Lite (a lager) and Lite-Brite (a light-box toy). Note: Brite is a nonstandard spelling of splendid. 10. Incorrect spelling: kreme Right: cream A few words that start with the sound/k/, however which are spelled with the letter c, are mainstream focuses for incorrect spelling. For instance: Krispy Kreme, Rice Krispies. Reward Incorrect spelling: biskit Right: bread A line of Nabisco nibble saltines utilizes this incorrect spelling: Chicken in a Biskit. Need to improve your English in a short time a day? Get a membership and begin getting our composing tips and activities day by day! Continue learning! Peruse the Spelling class, check our well known posts, or pick a related post below:50 Rhetorical Devices for Rational WritingOne Fell SwoopPresent Participle as Adjective

Thursday, August 13, 2020

Dwon Example

Dwon Example Dwon â€" Essay Example >  In the late 80’s and early 90’s, Australia experienced pressures to reconfigure its workplace relations arrangements so that it can conform to neo-liberal notions of flexibility in the labour market. Significant reforms were made in the late 80’s and early 90’s. A series of reforms which include the Industrial Relations Reform Act 1993 and the Industrial Relations Amendment Act (1992, 1994) were introduced by the government that was in place, that allowed a collective agreement for individual enterprise and encouraged the spread of enterprise bargaining. In Australia, this was exacerbated by financial and trade liberalization. Since early 80’s, the government realized that Australia’s industrial relations were poorly aligned with the changes that were taking place in the country’s economy. Australia government undertook radical employment relations reforms in the late 80’s and early 90’s, followed by nearly a decade of adaptive change (Birmingham, 1997). After Labor government being in power for 13 year, a coalition government was elected (comprising of National Party and Liberal Party) in the general election of 1996. This coalition government was subsequently re-elected in 1998, 2001 and in 2004, before being defeated in Labor Party in the Federal elections that took place in 2007. Labour law policy and Industrial relations were critical aspects of the Coalition’s social and political platform throughout the coalition government was in power and in pursuance of these employment reforms the coalition government introduced legislations that touches on employment relations (Birmingham, 1997). During the period that the Coalition government was in-power, a stream of legislation that deals with employment relations were introduced, with the major changes were found in its Work Choices (or Workplace Relations Amendment) Act 2005 and its Workplace Relations Act 1996. Numerous arguments has been put forward about the rationales on the legisla tive changes, particularly in its 2005 form, which revolutionalised Australian labour law standards. These changes include the desire to make employers and workers for making arrangements in the workplace that suited them rather than such arrangements entrenched by employment or industrial tribunals, restore managerial prerogative, the desire to reduce the complexity of workplace regulation and associated costs upon employers, the desire to increase productivity, the desire to replace adversarial workplace relations with a more co-operative system and so on. These were some argument brought forward by the government to redistribute wealth from capital to labour to a system and protect workers which was also concerned with making businesses in Australia to be competitive ones. Non-standard work has long been a feature of employment relations and Australian labour markets. In the past, non-standard work was regulated through the award system. Hence, it was difficult for businesses in Australia to access to and organization of non-standard work, historically; it was not a simple matter of businesses or employer choice. But after the passing of Workplace Relations Act 1996, this position of non-standard work was changed considerably, and in return, employers were provided with incentives that enable them to engage with workers under different arrangements for non-standard work. Empirically it has been found that non-standard work have been on the rise since early 90’s, and has continued to rise after Workplace Relations Act 1996 legislation was introduced (Birmingham 1997). These changes into industrial relations were responsible to growth in temporary employment in the Australian service sector (Waring 2003). However, between 1980 and 1990, the labor government chose to adopt an adaptive approach to reforms in the labor market, the government encouraged, rather than imposed labour market flexibility. The key measures that were set by the government in the sa me period were designed to promote incidence of enterprise-level bargaining (Birmingham 1997).

Wednesday, June 24, 2020

Essay on White Fang

Essay on White Fang This is a free sample essay on White Fang: The portrayal of the child figure is represented in the three novels Black Beauty, The Jungle Books, and White Fang. The use of this motif allows the audience to view the transformation of â€Å"children† into mature beings. In these novels, we watch Black Beauty, Mowglii, and White Fang grow from unshaped, unknowing beings primarily through the guidance of character who are not even their real parents but serve as mother figures. These characters (Beauty, Mowglii, and White Fang) learn the â€Å"rules† of their environment from many different characters and sources throughout the novel. These experiences (both positive and negative) in which they utilize what they know and grow from their mistakes (or misfortunes) are what helps in the rearing and guidance of the child figures on their path of learning. In all three novels, the reader is introduced to the child figures (Black Beauty, Mowglii, and White Fang) really at the beginning of their life. The only possible exception here is that you don’t know initially where Mowglii came from but this introduction is at the beginning of his life in the jungle. This portrayal of the child allows that reader to see them as the naÐ ¿ve clean slates they are, waiting for guidance and education. In Black Beauty, Beauty is portrayed from birth as a valuable addition to the farm and is named for his striking appearance. This ideal impression of the child figure conveys to the reader that although things are good now for this little colt, he will inevitably face hardships during his transformation that will shape him into a truly valuable being. In The Jungle Books, Mowglii is initially portrayed as a happy-go-lucky man cub who isn’t intimidated the least by his new surroundings. This confidence and fearlessness sets the scene for th e leader that Mowglii will become at the end of his transformation into adulthood. After being accepted into the wolf pack, he is nicknamed â€Å"frog†. This title is representative of the changes he will undergo throughout his adventures. It clearly indicates that Mowglii will become a new being. In the novel White Fang, White Fang is introduced almost immediately as the strongest of the litter. This child figure representation is yet again one that predicts the future of the being. This portrayal of White Fang as strong, aggressive and independent carries through to his adulthood as he gains the reputation for being one of the most savage dogs of the North. The difference here between The Jungle Books and White Fang is the initial portray of white Fang is not reflective of the mature caring dog he becomes. It is interesting to note here that although it seemed White Fang’s fate to become a savage wild beast, he in the end becomes a domesticated house pet with the proper compassion and guidance from his determined master, Weedon Scott. In these three novels, each of the characters portraying the child figure is educated about the ways of their world not only verbally, but also by their life experiences (or predicaments). In Black Beauty, Beauty really doesn’t face much of the conflict or harsh realities of the world outside his rosy picture. His seems to represent a protected child initially. He notices how his barn mate, Ginger, misbehaves and wonders how she could that way with such a giving and caring master. He is at the immature point in his life where he doesn’t realize that there is life outside of his own homestead. Even when Ginger tells Beauty of some of her life experiences and how they have shaped the â€Å"person† that she is today, Beauty can only sympathize. He cannot be fully affected by these realities until he, himself is exposed to them. Although he has had second hand exposure from Gingers tales, he cannot learn the lessons and change as a being unless he experiences life fo r himself. In The Jungle Books, Mowglii is protected by Bagheera, the black panther, and is taught the laws of the jungle by Baloo, the brown bear. Although it seems Mowglii is equipped with what he needs to make it in his new world, he faces many dangers of which only he can attempt to avoid. Mowglii has been provided the information of right and wring in the jungle, now it is up for this child to use his smarts to survive. After all, he is sought after by the jungle bully, Shere Khan, who wants Mowglii dead if for no other reason but to regain some of his own pride. The audience sees Mowglii’s transformation as a naÐ ¿ve child to an aggressive member of his society to a compassionate leader of his own people. This only occurs after the child figure obeys the laws of the jungle and utilizes what he has learned. In White Fang, the transformation of the child figure from a savage wolf to a civilized dog is remarkable. White Fang was reared to fend for himself. Although he also had this innate sense as he is three-quarters wolf, he was surrounded by experiences (whether it was famine or brutal fights) that taught him that it was the way of the wild to â€Å"eat or be eaten†. It seemed throughout most of this novel this â€Å"wild child† had no chance of ever being tamed. Ironically, it is the harsh environments that White Fang is exposed to (by the way of Gray Beaver and Beauty Smith), that help him in his transformation from the aggressive wolf to the house pet. Through the harsh guidance of Gray Beaver, White Fang learns obedience, work ethic and loyalty to his master, traits he would have never acquired if he had just lived in the wild. It is arguable, however, that White Fang didn’t necessarily need to be subjected to such harsh treatments become the Beloved Wolf. On t he other hand, these experiences allowed him to appreciate the care he received from his most humane master, Weedon Scott. It is after all, through the patience, understanding, and dedication of Scott that White Fang evolves from a savage wild child into a domestic family dog. Children are a product of their environment. This explanation is used even today to describe why people behave the way that they do. This idea is present in the novels discussed previously as well as in other works of 19th century children’s literature. You see in â€Å"The Little Match Girl† from Andersen’s Fairy Tales, how the poor pathetic child is reduced to keeping herself warm by lighting the matches that she is supposed to be selling. This account is a direct reflection of the pathetic world she was raised in. This exploitation of the child results in her untimely death. In The Waterbabies, it is how this idea is portrayed. Initially, Tom wants to be just like his miserable master, as that is all that he knows. Through his transformation under water, be becomes a product of a better environment. Also in Wilde’s â€Å"The Ugly Duckling†, the duckling feels ugly and doesn’t fit in because of the environment around him. Although he is jus t different than the others, he is led to believe that he is a horrific creature. He truly believes that he is a monstrosity of a sight and this is only because of the influences in his immediate environment. It isn’t until he steps out of his negative surroundings that he finally realizes what he truly is. In the three novels, Black Beauty, The Jungle Books, and White Fang, the child figures portrayed are inevitably products of their environment. You can watch each character grow and change with each new experience and set of surroundings. You can see how just the slightest actions or just a few words shape the adult beings that each character becomes. What a better world we would live in if everyone realized that the actions and voices can forever change the life of another being, whether it be human or animal. ______________ AdvancedWriters.com is a professional essay writing service which can provide high school, college and university students with 100% original custom written essays, research papers, term papers, dissertations, courseworks, homeworks, book reviews, book reports, lab reports, projects, presentations and other assignments of top quality. More than 700 professional Ph.D. and Master’s academic writers. Feel free to order a custom written essay on White Fang from our professional essay writing service.