D Question 38 1 pts You are trying to help a failing bookstore beef up its profits. The bookstore is a monopoly in town, and you think you can implement a two-part pricing strategy. The monthly demand for books is Q = 45 - P. And the marginal cost for each book is $3. (Assume there are 18 people in this bookstore's market.) What is the optimal usage fee (per-book price) you should charge? O $1 O $3 O $5 O $7