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

### Instruction:
Karen is considering her winter coat options. One coast costs $300 and will last for 15 years. The other coat costs $120 and will last for five years. How much money would Karen save over 30 years by buying the more expensive cost?

### Response:
 Kwanza tafuta idadi ya koti za bei rahisi Karen atahitaji kununua kwa miaka 30: 30 miaka / 5 miaka/koti = <<30/5=6>>6 koti
Kisha multiply idadi hiyo na bei ya kila koti ya bei rahisi ili kupata gharama jumla ya koti za bei rahisi: 6 koti * $120/koti = $<<6*120=720>>720
Kisha multiply idadi ya koti za bei ghali Karen atahitaji kununua kwa miaka 30: 30 miaka / 15 miaka/koti = <<30/15=2>>2 koti
Kisha multiply idadi hiyo na bei ya kila koti ya bei ghali ili kupata gharama jumla ya koti za bei ghali: 2 koti * $300/koti = $<<2*300=600>>600
Kisha subtract gharama jumla ya koti za bei ghali kutoka gharama jumla ya koti za bei rahisi ili kupata tofauti: $720 - $600 = $<<720-600=120>>120