Calculate percentage of X, quick & simple.
Let's take a quick example here:
You have a Target coupon of $4000 and you need to know how much will you save on your purchase if the discount is 13 percent.
Amount Saved = Original Price x Discount in Percent / 100
Amount Saved = (4000 x 13) / 100
Amount Saved = 52000 / 100
Amount Saved = $520 (answer).
In other words, a 13% discount for a purchase with an original price of $4000 equals $520 (Amount Saved), so you'll end up paying 3480.