Calculate percentage of X, quick & simple.
Let's take a quick example here:
You have a Target coupon of $4 and you need to know how much will you save on your purchase if the discount is 91 percent.
Solution:
Amount Saved = Original Price x Discount in Percent / 100
Amount Saved = (4 x 91) / 100
Amount Saved = 364 / 100
Amount Saved = $3.64 (answer).
In other words, a 91% discount for a purchase with an original price of $4 equals $3.64 (Amount Saved), so you'll end up paying 0.36.