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

### Instruction:
John buys 20 candy bars.  His brother Dave pays for 6 of them.  If each candy bar costs $1.50, how much did John pay?

### Response:
 เขาจ่ายเงินสำหรับลูกอม 20-6=<<20-6=14>>14 แท่ง
ดังนั้นเขาจ่ายเงิน 14*1.5=$<<14*1.5=21>>21