15/100 * 80 = 12
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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.
To find 15 percent of a number, multiply that number by 0.15. In this instance, 0.15 x 29.75 = 4.4625. Therefore, 15 percent of 29.75 is equal to 4.4625.
15.3