Lin’s father is paying for a $20 meal. He has a 15%-off coupon for the meal. After the discount, a 7% sales tax is applied. What does Lin’s father pay for the meal? Explain or show your reasoning.
a.) How much is the 15% coupon worth?
b.) What is the new sub-total after the discount is applied?
c.) How much is the sales tax (this is found using the sub-total)?
d.) How much is the total cost of the meal?