Calculate percentage of X, quick & simple.
Let's take a quick example here:
You have a Target coupon of $400 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 = (400 x 10) / 100
Amount Saved = 4000 / 100
Amount Saved = $40 (answer).
In other words, a 10% discount for a purchase with an original price of $400 equals $40 (Amount Saved), so you'll end up paying 360.