To get the the cost of how much Alexis is paying we first have to find the original cost and then subtract the $15 which is equal to 20% of the original number.
To find the original price you take the $15 and divide it by .20
15÷.20= 75
To get the original price of a percentage you do the opposite of if you were trying to find the % for example :
Well, because we know that he got $15 off, and it was a 20% coupon, we turn the 20% into a 5 instead of .5. We do this so we can multiply to find the total.
$15 x 5 = 75
If you type into your calculator $75 - 20%, you will get 60 which is 15 less than 75.
