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

### Instruction:
Ian spent half the money he made on doing online surveys. If he worked 8 hours doing surveys and on average he's able to earn $18 per hour doing surveys, how much money does he have left?

### Response:
Ian is able to earn $18 per hour doing surveys. If he worked 8 hours doing surveys, then he earned $18*8 = $<<18*8=144>>144
If he spent half of what he made, he spent $144*(1/2) = $<<144*(1/2)=72>>72
If Ian spent $72 of his earnings, then he has $144-$72 = $<<72=72>>72 remaining
#### 72