Suppose that the marginal revenue for firefighting protective clothes is MR = 479 - 4x and the marginal cost is MC = 4.5x + 20 with a fixed cost of $320. Assume R(0) = 0. a) How many units will result in a maximum profit? x b) Find the revenue function. R(x) = = c) Find the cost function. C(x) = d) What is the maximum profit (to the nearest dollar)? The maximum profit is

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