Assumed 20% tip is on the discounted meal.
The cost of the meal is $78.65 .
The cost of the meal after discount (15%) is
78.65⋅(1−0.15)≈$66.85
Tip (20%) is : 66.85⋅0.2≈$13.37
Total cost of the meal is 66.85+13.37≈$8
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