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
1.05
Expressed as a percentage, 5/21 is equal to 23.809523 recurring (that is, 23.809523809523....) percent.
21/5 dollars
(7 percent of 21) - (4 percent of 21) = 0.63