Answer:
$82.22
Explanation:
Price of meal before discount: $78.31
They leave a 20% tip that applies to the cost of the meal before the discount, so the tip is 20% of $78.31.
Now we calculate the amount of the tip.
20% of $78.31 =
= 0.2 * $78.31
= $15.66
The tip is $15.66. We will apply it later after we use the discount.
The meal's original price was $78.31 before the discount.
The discount is 15%. Now we find the amount of the discount.
15% of $78.31 =
= 0.15 * $78.31
= $11.75
The discount due to the coupon is $11.75
The final price of the meal is the original price, minus the discount, plus the tax.
final price = $78.31 - $11.75 + $15.66 = $82.22