The question in other words is: what is 20 percent-off $78.37? Find the amount of discount.
Replacing the given values in formula below we have:
Amount Saved = Original Price x Discount in Percent / 100. So,
Amount Saved = 78.37 x 20 / 100
Amount Saved = 1567.4 / 100
Amount Saved = $15.67 (answer).
In other words, a 20% discount for a item with original price of $78.37 is equal to $15.674 (Amount Saved).
Note that to find the amount saved, just multiply it by the percentage and divide by 100.