To calculate 90 percent of 20, you can start by converting the percentage into a decimal. To do this, divide 90 by 100. This gives you:
90 ÷ 100 = 0.90
Next, you multiply this decimal by the number you want to find the percentage of, which in this case is 20. So the calculation would look like this:
0.90 × 20 = 18
Therefore, 90 percent of 20 is 18.
In summary, when you want to find a percentage of a number, you can follow these simple steps: convert the percentage to a decimal and then multiply it by the number. This method can be applied to any percentage and any base number!