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

### Instruction:
 Mark alitumia dola 220 kufanya marekebisho ya gari lake. Gari lilihitaji vipuri viwili ambavyo kila kimoja kiliigharimu dola 20, na kazi ya fundi iligharimu dola 0.5 kwa dakika. Fundi alifanya kazi kwa saa ngapi?


### Response:
 Gharama ya kazi ni dola 0.5 * 60 = <<.5*60=30>>30 kwa saa
20 + 20 = $<<20+20=40>>40 kwa vipuri
220 - 40 = $<<220-40=180>>180 kwa kazi
180 / 30 = <<180/30=6>>6 masaa