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# How to calculate percentage

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What is 66% of 21?

##### Solution Summary

This solution shows how to calculate a given percentage of a number. It also offers tips on approximating percentages, for certain common percentages.

##### Solution Preview

There are two ways to get an answer to this question, depending on how exact you need your answer to be. In both cases, you just need to know that to find a certain percentage of a number, simply multiply the percentage and the number. However, you shouldn't multiply it as a percentage, ...

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