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

### Instruction:
 约翰每周捕捞3个螃蟹篮子。每个篮子可以装4只螃蟹。他每周捕捞两次。每只螃蟹卖3美元。他能赚多少钱？


### Response:
 每次他捕捞12只螃蟹。
他每周捕捞两次，所以每周捕捞24只螃蟹。
所以他每周赚72美元。