Moore Entertainment sells souvenir T-shirts at each rock concert that it sponsors. The shirts cost $11 each. Any excess shirts can be returned to the manufacturer for a full refund of the purchase price. The sales price is $29 per shirt. Required a. What are the total cost of shirts and cost per shirt if sales amount to 8,000, 8,500, 9,000, 9,500, or 10,000? b. Is the cost of T-shirts a fixed or a variable cost? a.Fixed cost b.Variable cost.