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

### Instruction:
 Jason等待一个顾客，账单总共是$15.00。Jason所在的州对餐厅销售额征收20%的税。如果顾客给了Jason一张$20的钞票，并告诉他留下找零，Jason的小费是多少？


### Response:
 首先计算税额，将$15.00乘以20%：$15.00 * 0.2 = $<<15*0.2=3.00>>3.00
然后从$20中减去餐费和税费，得到Jason的小费：$20 - $15.00 - $3.00 = $<<20-15-3=2.00>>2.00