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

### Instruction:
 两只白袜子比一只棕色袜子贵25美分。如果两只白袜子要45美分，那么你买15只棕色袜子要付多少钱？


### Response:
 两只白袜子比一只棕色袜子贵25美分，意味着一只棕色袜子的价格是0.45美元 - 0.25美元 = 0.20美元
买15只棕色袜子的费用是15 * 0.20 = 3.00美元