Price discrimination: Shooting Star Books is a small publishing company that specializes in science fiction books. Assume that the marginal cost and average variable cost of printing books is $0 per book, and there is not fixed cost. The annual demand is Q = 1200-50P. Marginal revenue is MR = 24-0.04Q. Find the profit-maximizing P, Q, and profit. (P=12 Q=600 profit=7200)