The price p (in dollars) and the demand x for a particular clock radio are related by the equation x = 4000 – 20p. (A) Express the price p in terms of the demand x, and find the domain of this function. (B) Find the revenue R(x) from the sale of x clock radios. What is the domain of R? (C) Find the marginal revenue at a production level of 2500 clock radios. (D) Interpret R'(3900) = - 190 00

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