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

### Instruction:
 John ananunua mashati 2. Shati la kwanza linagharimu $6 zaidi ya shati la pili. Ikiwa shati la kwanza linagharimu $15, gharama ya mashati yote ni kiasi gani, kwa dola?


### Response:
 Shati la pili linagharimu 15-6=<<15-6=9>>9 dola.
Mashati yote yanagharimu 15+9=<<15+9=24>>24 dola.