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
A

試題分析：根據(jù)本題描述，他買十二本練習(xí)本，四把小刀，五支鋼筆，兩把尺子和一個(gè)鉛筆盒，根據(jù)價(jià)格表描述，列式為：3*12+2.5*4+15*5+1.5*2+16=140，故選A。
點(diǎn)評：解答本題首先要理解小題內(nèi)容，然后結(jié)合價(jià)格表信息列式，然后算出得數(shù)。
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