Multiply by 10 and divide by 9
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To find 90 percent of a number, multiply the number by 0.9. For example, 100 x 0.9 = 90.This is because 0.9 is equal to 90 / 100, expressed as a decimal fraction.
Percent means out of 100: → 90% = 90/100 = 90 ÷ 100 = 0.9
10% off 29.52 = 90% of 29.52 = 29.52*90/100 = 26.568
90 = 100% X = 2.5% X = 2.5x90 ÷ 100 X = 2.25
multiply the number by .90 or just.9 like 90% of 100 is 90