Melisa and Jennifer threw a fiftieth birthday party for their father at a local restaurant. When the bill came, Melisa added a 15% tip of $42. Jennifer said that the service was wonderful and they should leave a 20% tip instead. How much is a 20% tip? Give me reasons, before answering the question
If 15% is known to be $42, then 5% can be found by dividing $42 ÷ 3 = $14. So 20% is $14 + $42 = $56. So the final answer is 56.