Your college newspaper, The Collegiate Investigator, sells for 90e per copy. The cost of producing x copies of an edition is given by Ctx) 60+0.10x + 0.001x2 dollars. (a) Calculate the marginal revenue R(x) and profit P(x) functions. HINT [See Example 2.1 R'(x)- P(X)= (b) Compute the revenue and profit, and also the marginal revenue and profit, if you have produced and sold 500 copies of the latest edition. revenue profit $ x x marginal revenue s marginal profit $ x per additional copy x per additional copy Interpret the results. The approximate-Select- from the sale of the 501st copy is s (c) For which value of x is the marginal profit zero? x coples Interpret your answer The graph of the profit function is a parabola with a vertex at x coples so the profit is at a maximum when you produce and sell