A department store buys 400 shirts at a cost of $7 200 and sells them at a selling
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Answer: b. {(–5, 3), (–7, 5), (–9, 6), (–12, 10), (–16, 12)}.
Answer: b. {(–5, 3), (–7, 5), (–9, 6), (–12, 10), (–16, 12)}.