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I don't understand the profit problem of mathematics in grade three. ~ ~ ~ ~ formula
Pricing = cost+profit

Profit = cost × profit rate pricing = cost ×( 1+ profit rate)

Profit rate = profit/cost percentage = (selling price-cost)/cost × 100%

Selling price = pricing × discount percentage interest = principal × interest rate × number of periods

Sum of principal and interest = principal ×( 1+ interest rate× number of periods)

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