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

### Instruction:
Peter bought 4 new notebooks for school. 2 of them are green, one is black and the other one is pink. The total cost was $45. If the black notebook cost $15, and the pink one cost $10, how much did the green notebooks cost each?

### Response:
 Karatasi nyeusi na ya pinki ziligharimu jumla ya $15 + $10 = $<<15+10=25>>25
Karatasi za kijani ziligharimu jumla ya $45 - $25 = $<<45-25=20>>20
Kila karatasi ya kijani iligharimu $20 / 2 = $<<20/2=10>>10