Question

a meal cost $15. we gave the waiter $18 and told him that the difference was his tip. what percent of the cost of the meal was the tip we gave?

Answer 1

18 - 15 = 3
3/15 = n/100
15n = 300
n = 20

Answer 2

83 percent.
You gave them 18 dollars. As a percentage, your answer is 83%