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

### Instruction:
John decides to replace all his VHS with DVDs.  He can trade in his VHS for $2 each and then buy the DVDs for $10 each.  If he has 100 movies, how much does it cost to replace his movies?

### Response:
 มีค่าใช้จ่าย 10-2=$<<10-2=8>>8 ในการเปลี่ยนแทนแต่ละเรื่อง
ดังนั้น จะต้องใช้เงิน 8*100=$<<8*100=800>>800