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 140 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. Required:
a. Assuming that the demand for books depends linearly on the price, what price gives you the maximum revenue?
b. What does that revenue amount to?