Below is an instruction that describes a task. Write a response that appropriately completes the request in Thai. Please answer in Thai.

### Instruction:
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?

### Response:
 ถ้าทราบว่า 15% เท่ากับ $42 แล้ว 5% สามารถหาได้โดยการหาร $42 ÷ 3 = $<<42/3=14>>14
ดังนั้น 20% เท่ากับ $14 + $42 = $56.