To find 5 percent of a number, multiply the number by 0.05. In this instance, 0.05 x 21 = 1.05. Therefore, 5 percent of 21 is equal to 1.05.
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4.2
Expressed as a percentage, 5/21 is equal to 23.809523 recurring (that is, 23.809523809523....) percent.
21/5 dollars
To find a percent of a number would be by changing that percent into a decimal to multiply that number. So since 5% is 0.05, then 0.05 x 21 = 1.05. Then 21 increases by 5% as: 21 + 1.05 = 22.05. By words that is: twenty-one plus one and five hundredths equals twenty-two and five hundredths.
420% = 4.2 = 21/5