Bell Entertainment sells souvenir T-shirts at each rock concert that it sponsors. The shirts cost \$7 each. Any excess shirts can be returned to the manufacturer for a full refund of the purchase price. The sales price is $16 per shirt. Required a. What are the total cost of shirts and cost per shirt if sales amount to 2,000,2500,3,000,3,500, or 4,000 ? b. Is the cost of T-shirts a fixed or a varlable cost? Complete this question by entering your answers in the tabs below. Complete this question by entering your answers in the tabs below. Is the cost of T-shirts a fixed or a variable cost