By using the 20 percent off coupon that she found in the newspaper, Jill saved $4 on the extra large bag of dog food that she bought.

Percents
Total
20%
20%
20%
20%
20%
100%
$4
$4
$4
$4
$4


What was the cost of the bag of dog food without the coupon?
$8
$12
$16
$20