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

### Instruction:
 詹姆斯买一送一的牛排。价格是每磅15美元，他买了20磅。他为这些牛排付了多少钱？


### Response:
 他付钱买了20/2=<<20/2=10>>10磅的牛排
那花费了10*15=$<<10*15=150>>150。