Take any number, multiply by 15% and you have 15% of that number. 100x15% is 15. 15 is 15% of 100.
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To convert a percent to a decimal, divide by 100: 15 / 100 = 0.15
To turn a percent to a fraction, you take the percent and divide it by 100. So 15% is actually 0.15.
To increase a number by a certain percent, multiply it by (1 + n/100). For example, to increase a number by 15 percent, multiply it by (1 + 15/100), or 1.15. To decrease a number by 15 percent, multiply it by (1 - 15/100), or 0.85.
28
100.