Calculate percentage of X, quick & simple.
Let's take a quick example here:
You have a Target coupon of $310 and you need to know how much will you save on your purchase if the discount is 99 percent.
Solution:
Amount Saved = Original Price x Discount in Percent / 100
Amount Saved = (310 x 99) / 100
Amount Saved = 30690 / 100
Amount Saved = $306.9 (answer).
In other words, a 99% discount for a purchase with an original price of $310 equals $306.9 (Amount Saved), so you'll end up paying 3.1.