Suppose the demand equation is 200x + 10p = 10000, where x is the number of items sold when the per unit price is p dollars.
Determine
(a) the revenue function,
(b) the domain of the revenue function,
(c) the revenue derived from the sale of the 20th item-the marginal revenue when x = 20.
(d) the level of production that maximizes the revenue, and the maximum revenue.