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 bata 30 kwa $10 kila moja. Wanapima pauni 4 na anawauza kwa $5 kwa pauni. Alipata faida kiasi gani?


### Response:
 Bata wanagharimu $10*30=$<<10*30=300>>300
Anauza kila bata kwa 4*5=$<<4*5=20>>20
Hivyo anauza bata 30*20=$<<30*20=600>>600 thamani
Hivyo alipata 600-300=$<<600-300=300>>300