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

### Instruction:
Tim's car goes down in value by $1000 a year.  He bought it for $20,000. How much is it worth after 6 years?

### Response:
 รถของเขาสูญเสียมูลค่า $1000 x 6 = $<<1000*6=6000>>6000
ดังนั้นรถมีมูลค่า $20,000 - $6,000 = $<<20000-6000=14000>>14,000