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

### Instruction:
 John ananunua barbells 3 na anatoa $850 na kupata $40 kama mabadiliko. Kila barbell iligharimu kiasi gani?


### Response:
 Jumla ya bei ya barbells ilikuwa $850 - $40 = $<<850-40=810>>810
Hivyo kila moja iligharimu $810/3 = $<<810/3=270>>270