Revenue analysis. The price p (in dollars) and the demand x for a particular steam iron are related by the equation x = 1,000 - 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 steam irons. What is the domain of R? (C) Find the marginal revenue at a production level of 400 steam irons and interpret the results. (D) Find the marginal revenue at a production level of 650 steam irons and interpret the results