An accessories company finds that the cost and revenue, in dollars, of producing x belts is given by C(x) = 720 + 31x - 0.067x and R(x) = 65x 10 respectively. Determine the rate at which the accessories company's average profit per belt is changing when 176 belts have been produced and sold. First, find the rate at which the average profit is changing when x belts have been produced. P'(x) =

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Q: part ii, thank you very much.

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