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

### Instruction:
Bill the miner discovers a vein of fool's gold. He successfully sells 8 ounces to a merchant, but when he tries to sell to the sheriff he's arrested, fined $50 and run out of town on a rail. If Bill earned $9 for every ounce of fool's gold he sold, how much money is he left with?

### Response:
 Kwanza pata kiasi cha pesa Bill alichopata kutoka kwa mwenye biashara: 8 unsi * $9/unsi = $<<8*9=72>>72
Kisha toa faini ili kujua kiasi cha pesa alichobaki nacho: $72 - $50 = $<<72-50=22>>22