At a restaurant, I was given a bill for $95.11 that included a 15% gratuity.
I wanted to leave a 20% tip instead of the 15% tip already included.
How much should I add to the bill?
Solution to the Problem:
I should add $4.13 to the bill of $95.11 for a total of $99.24.
Let x = original bill without the 15% gratuity.
Then x + .15x = 95.11
Therefore, x = $82.70 (the price for the food)
20% of $82.70 = $16.54
15% of $82.70 = $12.41
Subtracting, you get $4.13