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Estimate a 15% tip on a dinner bill of $67.48 by rounding the bill amount to the nearest ten dollars

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15% is 10% + 5% (or 0.15 = 0.1 + 0.05, dividing each percent by 100). Thinking about it this way is useful for two reasons. First, it's easy to multiply any number by 0.1; just move the decimal point left one digit.

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