Calculate percentage of X, quick & simple.
Let's take a quick example here:
You have a Target coupon of $521 and you need to know how much will you save on your purchase if the discount is 90 percent.
Solution:
Amount Saved = Original Price x Discount in Percent / 100
Amount Saved = (521 x 90) / 100
Amount Saved = 46890 / 100
Amount Saved = $468.9 (answer).
In other words, a 90% discount for a purchase with an original price of $521 equals $468.9 (Amount Saved), so you'll end up paying 52.1.