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 daftari 5 ambazo kila moja ina kurasa 40. Anatumia kurasa 4 kwa siku. Kwa muda gani daftari hizo zitadumu?


### Response:
 Alipata kurasa 5*40=<<5*40=200>>200
Hivyo zitadumu kwa siku 200/4=<<200/4=50>>50.