[求助]陈向东 107

vivian1112

L left a tip for his waiter equal to 20% of his entire dinner check,including tax. What was the amount of the dinner check?

(1) The sum of the dinner check and the tip was $16.8.

(2) L's tip consist of 2 bills and 4 coins.

ANS: A

我的问题是为何（2）是不充分的，tip=2.4  entire dinner check=2.4/0.2=12  dinner check=12-2.4=9.6, 错在何处？

zhsdu

bill和coin的面值题中没告诉你啊

vivian1112

谢谢 我把bill coin直接看成1单位了