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

### Instruction:
 达芙妮在超市买了5公斤的土豆。如果2公斤的土豆价格是6美元，她要支付多少钱？


### Response:
 1公斤土豆售价为6 / 2 = <<6/2=3>>3美元。
所以，5公斤土豆的价格为5 * 3 = <<5*3=15>>15美元。