Calculate percentage of X, quick & simple.
Let's take a quick example here:
You have a Target coupon of $84 and you need to know how much will you save on your purchase if the discount is 21 percent.
Solution:
Amount Saved = Original Price x Discount in Percent / 100
Amount Saved = (84 x 21) / 100
Amount Saved = 1764 / 100
Amount Saved = $17.64 (answer).
In other words, a 21% discount for a purchase with an original price of $84 equals $17.64 (Amount Saved), so you'll end up paying 66.36.