you just move the decimal place two places to the right
you get 0.021, which is equivalent to 2.1%
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Decimal 21.0=21 percent 2100
21% written as a decimal is 0.21
6 is what percent of 21 = 6 / 21 = 0.285714Converting decimal to a percentage: 0.285714 * 100 = 28.57%
18 is what percent of 21= 18 / 21= 0.857143Converting decimal to a percentage:0.857143 * 100 = 85.71%
250% = 21/2 or, as a decimal, 2.5