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

### Instruction:
 乔西收到了50美元的礼物。她计划买两盒唱带，每盒售价9美元，以及一套耳机，售价25美元。她还剩下多少钱？


### Response:
 两盒唱带将花费2 × 9 = 18美元。
她总共花费了18 + 25 = 43美元。
乔西将剩下50 - 43 = 7美元。