
Mark M. answered 08/12/15
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Mathematics Teacher - NCLB Highly Qualified
c = amount charged for the books
350c = amount received for the books
350c ≥ 1137.5 + 1500 The amount received must be at least the cost plus profit.
350c ≥ 2637.50 Divide both sides by 350
c ≥7.5357
They must sell the books for at least $7.54.