The price p (in dollars) and the demand x for a brand of running shoes are related

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The price p (in dollars) and the demand x for a brand of running shoes are related by the equation 

x = 4,000 - 40p

(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 pairs of running shoes. What is the domain of R? 

(C) Find the marginal revenue at a production level of 1,600 pairs and interpret the results. 

(D) Find the marginal revenue at a production level of 2,500 pairs, and interpret the results.  

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