Calculate percentage of X, quick & simple.
Let's take a quick example here:
You have a Target coupon of $390 and you need to know how much will you save on your purchase if the discount is 66 percent.
Solution:
Amount Saved = Original Price x Discount in Percent / 100
Amount Saved = (390 x 66) / 100
Amount Saved = 25740 / 100
Amount Saved = $257.4 (answer).
In other words, a 66% discount for a purchase with an original price of $390 equals $257.4 (Amount Saved), so you'll end up paying 132.6.