Liu Ming wants to buy some school things. According to the list, if he buys twelve exercise books, four knives, five pens, double rulers and a pencil-box, he will pay    .

Thing	Knife	Pen	Exercise book	Ruler	Pencil-box
Price	￥2.50	￥15.00	￥3.00	￥1.50	￥16.00
Good news : If you spends more than one hundred yuan in buying pens, you will enjoy a 40% off for the whole list.

A. 140 yuan       B. 84 yuan        C. 56 yuan