For this kind of problem you would multiply the discount by the sale price. That would look like this 146.54 * .15 = 21.98. That answer would be how much the discount was. Once you find the discount you add the discount to the sale price to know what the original price was. That would be 146.54 + 21.98 = $168.52.
Okay, to work out the original price, all you have to do is get the sale price ($146.54) and then divide it by 1 - 0.[whatever the percentage is]. In this case, the percentage is 15%, so you do 1 - 0.15 = 0.85.
So to work out the original price, you do: 146.54 ÷ 0.85 = $172.40
