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

### Instruction:
Todd has $20. He buys 4 candy bars that cost $2 each. How much money in dollars does Todd have left?

### Response:
 ขนมอมช็อคเลตราคา 4 x 2 = $<<4*2=8>>8
ท็อดจะเหลือเงิน 20 - 8 = $<<20-8=12>>12.