Answer:
$82.65
Step-by-step explanation:
First, find the cost with the discount:
78.72(0.85)
= 66.91
Then, find the amount of the tip:
78.72(0.2)
= 15.74
Then, add together the cost and tip:
66.91 + 15.74
= 82.65
So, the total cost of the meal was $82.65