$9 with the product costing $36. To find the percent, multiple 45 by .2 which equals nine. If the product was 15% off, you would multiply by .15 and if it was .40 percent, multiply by .45.

To find 120 percent of a value, multiply the value by 1.2. In this instance, 1.2 x 45 = 54. Therefore, 120 percent of 45 dollars is equal to 54 dollars.