$2\mathrm{.}5$

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Stuart Entertainment sells souvenir T$-$shirts at each rock concert that it sponsors. The shirts cost $$5$ each. Any excess shirts can be returned to the manufacturer for a full refund of the purchase price. The sales price is $$28$ per shirt.

Required

What are the total cost of shirts and cost per shirt if sales amount to $5,000,5,500,6,000,6,500,$ or $7,000?$

Is the cost of T$-$shirts a fixed or a variable cost?