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

### Instruction:
Daria is raising money for a new vacuum cleaner. So far, she has collected $20 in her piggy bank and has decided to put $10 in it each week. If the vacuum cleaner costs $120, how many weeks will it take her to raise enough money to cover this expense?

### Response:
 Kifaa cha kusafishia nyumba kinagharimu $120, hivyo Daria anahitaji $120 - $20 = $<<120-20=100>>100 zaidi.
Daria atahitaji wiki 100 / 10 = <<100/10=10>>10 zaidi, ili aweze kununua kifaa cha kusafishia nyumba.