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 100 percent.
Solution:
Amount Saved = Original Price x Discount in Percent / 100
Amount Saved = (4000 x 100) / 100
Amount Saved = 400000 / 100
Amount Saved = $4000 (answer).
In other words, a 100% discount for a purchase with an original price of $4000 equals $4000 (Amount Saved), so you'll end up paying 0.