Calculate percentage of X, quick & simple.
Let's take a quick example here:
You have a Target coupon of $90 and you need to know how much will you save on your purchase if the discount is 64 percent.
Solution:
Amount Saved = Original Price x Discount in Percent / 100
Amount Saved = (90 x 64) / 100
Amount Saved = 5760 / 100
Amount Saved = $57.6 (answer).
In other words, a 64% discount for a purchase with an original price of $90 equals $57.6 (Amount Saved), so you'll end up paying 32.4.