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

### Instruction:
Tim won a $100 raffle.  He gave away 20% to his friend.  How much did he keep?

### Response:
 เขาให้ไป 100 x 0.2 = <<100*0.2=20>>20 เหรียญ
ดังนั้นเขาเก็บไว้ 100 - 20 = <<100-20=80>>80 เหรียญ