25%
25% of 640 is 160
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640*.25=160
160% of 400 = 160/100 x 400/1 = 160/1 x 4/1 = 640
160 x 4 = 640, therefore 160 is 1/4 of 640.
When you want to calculate a percent, you take the first number divided by the "of number."For this, it is 400/640=0.625Then you take the answer and multiple it by 100, moving the decimal to the right 2 digits to get the percent.0.625*100=62.5%Recommend please! :D
Deducting 20% off 800 would be 800-160 which is 640