Calculate percentage of X, quick & simple.
Let's take a quick example here:
You have a Target coupon of $109 and you need to know how much will you save on your purchase if the discount is 10 percent.
Solution:
Amount Saved = Original Price x Discount in Percent / 100
Amount Saved = (109 x 10) / 100
Amount Saved = 1090 / 100
Amount Saved = $10.9 (answer).
In other words, a 10% discount for a purchase with an original price of $109 equals $10.9 (Amount Saved), so you'll end up paying 98.1.