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

### Instruction:
Kurt's old refrigerator cost $0.85 a day in electricity.  He recently bought a new energy-efficient refrigerator that only cost $0.45 a day in electricity.  How much money does Kurt save in a 30-day month with his new refrigerator?

### Response:
 Katika muda wa siku 30, jokofu la zamani linagharimu $0.85 kwa siku * 30 siku = $<<0.85*30=25.50>>25.50
Katika muda wa siku 30, jokofu jipya linagharimu $0.45 kwa siku * 30 siku = $<<0.45*30=13.50>>13.50
Katika muda wa siku 30, Kurt anaokoa $25.50 gharama ya jokofu la zamani - $13.50 gharama ya jokofu jipya = $<<25.5-13.5=12.00>>12.00 kwa mwezi