Calculate percentage of X, quick & simple.
Let's take a quick example here:
You have a Target coupon of $13 and you need to know how much will you save on your purchase if the discount is 30 percent.
Solution:
Amount Saved = Original Price x Discount in Percent / 100
Amount Saved = (13 x 30) / 100
Amount Saved = 390 / 100
Amount Saved = $3.9 (answer).
In other words, a 30% discount for a purchase with an original price of $13 equals $3.9 (Amount Saved), so you'll end up paying 9.1.