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