Lacy’s Coupon - $20 off
Lacy’s Coupon - 20% off
John has two coupons from Lacy’s Department Store, one for $20 off and another for 20% off. John wants to purchase a shirt for $64. His friend Reginald told him to use the 20% off coupon because it is the best deal and his friend Cameron told him to use the $20 off coupon because it is the best deal. Which friend is correct and why?

help pls