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

### Instruction:
 约翰买了买一送一的罐头汤。他买了30罐，原价是0.60美元。他要支付多少钱？


### Response:
 他支付了30/2=<<30/2=15>>15罐。
这个花费是15*0.6=$<<15*0.6=9>>9。