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I am a junior three student, and I have always been puzzled about the application of mathematics profit. Is there any good way to solve this problem? Ask for advice.
First, make clear the relationship among profit, price, interest rate and cost.

Profit = actual price * interest rate

Profit = actual price-cost price.

Interest rate = (actual price-cost price)/actual price.

Secondly, clarify the quantitative relationship in the problem.

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