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

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

### Response:
He gave away 100*.2=$<<100*.2=20>>20
So he kept 100-20=$<<100-20=80>>80
#### 80