Gibson Entertainment sells souvenir T-shirts at each rock concert that it sponsors. The shirts cost $5 each. Any excess shirts can be returned to the manufacturer for a full refund of the purchase price. The sales price is $23 per shirt. Required a. What are the total cost of shirts and cost per shirt if sales amount to 7,000, 7,500,8,000, 8,500, or 9,000? 7,000 7,500 8,000 8,500 9,000 Number of shirts sold Total cost of shirts Cost per shirt