OHaganBooks.com has been experiencing a run of bad luck with its summer college intern program in association with PCU (Party Central University), begun as a result of a suggestion by Marjory Duffin over dinner one evening. The frequent errors in filling orders, charges from movie download sites and dating sites, and beverages spilled on computer equipment have resulted in an estimated weekly cost to the company of C(x)=15x2 − 5.5x + 4,000 dollars, where x is the number of college interns employed. (a)What is the marginal cost at a level of 10 interns? (b)What is the average cost per intern at a level of 10 interns? (c)What is the marginal average cost at a level of 10 interns? (d)Interpret the results of parts (a), (b), and (c). At an employment level of 10 interns, the cost is increasing at a rate of $____  per additional intern, and it costs an average of $ _____ per intern to to employ the first 10 interns. Moreover, the average cost is decreasing at a rate of $ _____ per intern per additional intern employed.

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