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

### Instruction:
 萨莎听说种树有助于降低当地的温度。每种植一棵树，温度下降0.1度。种一棵树的成本是6美元。如果她成功将当地温度从80度降低到78.2度，那么种树的成本是多少？


### Response:
 温度下降了1.8度，因为80 - 78.2 = <<80-78.2=1.8>>1.8
她种了18棵树，因为1.8 / 0.1 = <<1.8/.1=18>>18
种树的成本是108美元，因为18 x 6 = 108