Answer:
The total cost is $82.51
Explanation:
To find the total cost of the meal, first find the discount amount. We can get that by multiplying the discount percentage by the cost of the meal.
$78.58 * 15% = $11.79
Now we also need to find the tip amount, which we can calculate by multiplying the percentage by the overall cost.
$78.58 * 20% = $15.72
Now we take the amount of the meal and subtract the discount and add the tip.
$78.58 - $11.79 + $15.72 = $82.51