2. The average cost E(x) in dollars of manufacturing x units of a certain camera is given by E(X) = 0.005X -| 60 + 15000x'l (a) What is the marginal average cost function? (b) What is the marginal average cost of producing 1500 cameras monthly? Write out the answer giving a clear interpretation of this answer. (Do not use the word marginal in your sentence.) (c) If the company is manufacturing 1500 cameras monthly, based on your answer in (b), would manufacturing more cameras monthly produce a smaller average cost? Give a reason for your answer. (d) How many cameras should they produce monthly, to minimize the average cost? What is the minimum average cost? i. Find the critical point. ii. Determine if the critical point is a relative minimum or maximum by either making a sign chart for the derivative or using the second derivative. iii. Write a sentence answer to the