11. Cornelius' Cheeseburgers sells gourmet cheeseburgers. These cheeseburgers are so good, it is the only item on the menu. In recent years, Cornelius' breakeven point has been 40,000 cheeseburgers. Annual fixed cost are $200,000 and the cheeseburgers have a sales price of $15. What is the contribution margin per unit of each cheeseburger? A) $5 B) $13 C) $18 D) $40 E) None of the above