IV. A small business determined that the price-demand and cost functions for producing and selling x notebooks are given by p(x) = 70 -0.25x and C(x) = 0.5x² + 10x + 800, respectively, where p and Care in pesos. 1. Find the marginal profit when 20 notebooks are sold. 2. At what production level is the average cost per notebook at a minimum?

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