The price-demand equation and the cost function for the production of a certain product ar r = 6940 — 20p and C(x) = 7200 + 60x + 2x², respectively, where is the number of units tha can be sold monthly at a price p (in pesos) per piece. (a) Using marginals, approximate the revenue in selling the 81st unit. (b) How many units are needed to be prepared if the goal is to minimize the average production cost per unit? (e) How many units are needed to be prepared if the goal is to maximize the profit?

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