Calculate percentage of X, quick & simple.
Let's take a quick example here:
You have a Target coupon of $138 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 = (138 x 99) / 100
Amount Saved = 13662 / 100
Amount Saved = $136.62 (answer).
In other words, a 99% discount for a purchase with an original price of $138 equals $136.62 (Amount Saved), so you'll end up paying 1.38.