There are two bookstores in Hartford. BookstoreAhas no fixed costs and constant marginal costs of $5 per book. BookstoreBalso has no fixed costs and but has higher marginal costs of $6 per book due to a bad distribution deal with the publishing company.

Demand for books in Hartford is given by: Q = 100 - 10P. The two bookstores set their orders for books at the beginning of each month. The market price for books in Williamsburg that month is then determined by the total number of books supplied by the two bookstores combined.

Suppose bookstoreBorders 20 books. What is the profit-maximizing number of books for firmAto order?

Suppose bookstore A orders 20 books. What is the profit-maximizing number of books for firm A to order?