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Estimate a 20% tip on a dinner bill of $171.81 by first rounding the bill amount to the nearest ten dollars.

Estimate a 20% tip on a dinner bill of $171.81 by first rounding the bill amount to the nearest ten dollars.
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Estimate a 20% tip on a dinner bill of $171.81 by first rounding the bill amount to the nearest ten dollars.

User ElParaguayo
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1 Answer

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$34 is a proper 20% tip on a $171.81 dinner. Move the decimal point twice to the left, then multiply that twice.
User GingerHead
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