13.9 Suppose a firm engaged in the illegal copying of computer CDs has a daily short-run total cost function given by STC
q 2  25.

a. If illegal computer CDs sell for $20, how many will the firm copy each day? What will its profits be?

b. What is the firm’s short-run producer surplus at P  $20?

c. Develop a general expression for this firm’s producer surplus as a function of the price of illegal CDs.