To find 10% divide by 10.
10% = 9
So 20% = 9 x 2 = 18
Finally 20% off 90 = 90 - 18 = 72
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72 dollars !
20*.90 = 18
what percent of 90 is 20? The answer is 22.2222222
90 - 20% = 72
20% of 450 is 90 So 80% of 450 will be 360