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4. Working Backwards from Percentage

Sometimes it is necessary to calculate a number when given a percentage value. Consumers will run into this situation when figuring out how much to tip a server or how much they'll pay in simple interest. It can also be used to determine the amount of sales tax they'll have to pay for an item. A potential example might be figuring out how much of a tip to leave on a $35 meal if the standard tip is 15%.

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