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Divide it by 5, then add a hundredth of the original number, e.g. 21% of 345 would be 69 + 3.45 = 72.45

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Q: How do you work out 21 percent of a number?
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To find 75 percent of a number, multiply the number by 0.75. In this instance, 0.75 x 21 = 15.75. Therefore, 75 percent of 21 is equal to 15.75.


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How do you show your work for 21 is what percent of 168?

21 is what percent of 168:= 21 / 168= 0.125Converting decimal to a percentage:0.125 * 100 = 12.5%