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

### Instruction:
 Chaji ya betri kwenye kifaa cha kusafisha nyumba bila waya cha Mary inadumu dakika kumi. Inamchukua dakika nne kusafisha kila chumba katika nyumba yake. Mary ana vyumba vitatu, jikoni, na sebule. Mary anahitaji kuchaji kifaa chake cha kusafisha nyumba mara ngapi ili kusafisha nyumba yake nzima?


### Response:
 Mary ana vyumba 3 + 1 + 1 = <<3+1+1=5>>5 katika nyumba yake.
Kwa dakika 4 kwa chumba, itamchukua dakika 4 * 5 = <<4*5=20>>20 kusafisha nyumba yake nzima.
Kwa chaji ya dakika 10, atahitaji kuchaji kifaa chake cha kusafisha nyumba 20 / 10 = 2 mara ili kusafisha nyumba yake nzima.