15 percent of 120 dollars is 18 dollars.
If you take it away from the 120 dollars, there are 102 dollars remaining.
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40% of 120 dollars = 120*40/100 = 48 dollars. So 40% off = 120 - 48 = 72 dollars.
$84
10 percent off of 120 pounds is 12 pounds.
Percentage means a fraction with a denominator of 100. 15 percent is 15/100. 15% of something means you multiply it by 15/100. Therefore 15% of 120 is 120*15/100 = 1800/100 = 18. In dollars, 15% of $120 is $18. Now 15% OFF of $120 means you subtract 15% from the original price. So $120 - $18 = $102. Final answer. Or you could say that 15% (of anything) OFF 100% is 85% because 100 - 15 = 85. $120*85/100 = $10,200/100 = $102. Same answer of course.
15 percent of 15 dollars is 2.25 dollars off, leaving 12.75