15 is 15% of 100
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15% off of 5.59 = 85% of 5.59 = 5.59*85/100 = 4.7515
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.
37.5 I got this by solving for x in the proportion 15/100=x/250
40% off of 15 dollars = 60 left of 15 dollars = 15*60/100 = 9 dollars.
5.49 with 15 percent off is 4.6665.