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

### Instruction:
Austin bought his seven friends each a robot. Each robot costs $8.75.  He was charged $7.22 total for tax. He left with $11.53 in change. How much did Austin start with?

### Response:
The total amount for the robots was 7*8.75=$<<7*8.75=61.25>>61.25.
The total amount for the purchase was 61.25+7.22=$<<61.25+7.22=68.47>>68.47
He had 11.53+68.47=$<<11.53+68.47=80>>80 to start.
#### 80