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

### Instruction:
An auto shop has a part that Clark needs for $80. Clark buys 7 of them and got a discount. If Clark only had to pay $439, how much was the discount?

### Response:
 ต้นเดิมชิ้นส่วนรถจะมีราคาทั้งหมด 7 * 80 = <<7*80=560>>560 ดอลลาร์
คลาร์คได้รับส่วนลด 560 - 439 = <<560-439=121>>121 ดอลลาร์