The demand function for a certain book is given by the function x = D(p) = 50e-0.004p. Find the marginal demand D'(p). OA. D'(p) = 0.2e-0.004p OB. D'(p) = -0.2pe-0.004p-1 OC. D'(p) = -0.2e-0.004p OD. D'(p) = -0.004e-0.004p …..

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