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

### Instruction:
Janet buys 45-pound containers of cat litter for $21 each.  If her cat litter box holds 15 pounds of cat litter, and she changes out the litter weekly, how much will it cost, in dollars, for her to buy enough litter to last 210 days?

### Response:
 Kuna wiki 210/7=<<210/7=30>>30 katika siku 210.
Kwa paundi 15 za mchanga wa paka kwa wiki, sanduku lake la mchanga wa paka linahitaji paundi 30*15=<<15*30=450>>450 za mchanga wa paka katika siku 210.
Kwa vyombo vya paundi 45 vya mchanga wa paka, atahitaji kununua 450/45=<<450/45=10>>10 vyombo.
Kwa $21 kwa kila chombo, itagharimu 10*21= $<<10*21=210>>210 kununua mchanga wa kutosha kwa siku 210.