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

### Instruction:
The total cost of Olivia’s groceries was $42. The bananas cost her $12, the bread cost her $9, and the milk cost her $7. The only other groceries she bought were apples. In dollars, how much money did the apples cost her?

### Response:
 Gharama ya pamoja ya ndizi, mkate, na maziwa ilikuwa 12 + 9 + 7 = $<<12+9+7=28>>28.
Tofauti kati ya hii na jumla ni gharama ya maembe, ambayo lazima Olivia aligharimu $42 - $28 = $14.