Subtracting 20 percent from 32 dollars gives 32 x (1 - (20/100)) = 32 x 0.8 = 25.6. Therefore, 20 percent off $32 is equal to $25.60.
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32 dollars
$6.40
10% of 160 dollars is 16 dollars so 20% must be 32 dollars, so if you take 32 dollars away from the original price of 160 dollars the sale price would be 128 dollars.
Start with 100. 20% off leaves 80, 15% of 80 is 12, leaving 68, an overall reduction of 32%
divide 32 by 0.05 5 cents to a nickel, 20 nickels to a dollar, 20 x 32 = 640