Your underground used-book business is booming. Your policy is to sell all used versions of Calculus and You at the same price (regardless of condition). When you set the price at $10, sales amounted to 160 volumes during the first week of classes. The following semester, you set the price at $30 and sales dropped to zero.
Assume that the demand for books depends linearly on the price.
(1) What price gives you the maximum revenue?
(2) What does that revenue amount to?