Calculate Percentage of a Number

What is percent of a number? How much is % of a number?
%

2.1% of 20.4 =
0.4284
20.4 - 2.1% =
19.9716

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  1. What is 2.1 percent (%) of 20.4?
  2. 2.1 percent of 20.4 $?
  3. how much is the 2.1 percent tax of $ 20.4?
  4. Or maybe: 2.1 is how many percent of 20.4?
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