Question

Help >_< 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 111 volumes during the first week of classes. The following semester, you set the price at $30 and sold not a single book.

Assuming that the demand for books depends linearly on the price, what price gives you the maximum revenue?

$______ per book?

What does that revenue amount to? (Round your answer to the nearest cent.)

$______?