Exercise 11-11A (Algo) Fixed versus variable cost behavior LO 11-1, 11-2 Perez Entertainment sells souvenir T-shirts at each rock concert that it sponsors. The shirts cost $13 each. Any excess shirts can be returned to the manufacturer for a full refund of the purchase price. The sales price is $28 per shirt. Required a. What are the total cost of shirts and cost per shirt if sales amount to 6,000,6,500,7,000,7,500, or 8,000 ? b. Is the cost of T-shirts a fixed or a variable cost? Complete this question by entering your answers in the tabs below. Is the cost of T-shirts a fixed or a variable cost