The price p (in dollars) and the demand x for a particular clock radio are related by the equation x = 4000-80p. (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 2800 clock radios. (D) Interpret R'(2900) = -22.50.

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