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本題由lindy提供
A certain taxi company charges $3.10 for the first 1/5
(A) $15.60
(B) $16.00
(C) $17.50
(D) $18.70
(E) $19.10
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答案：
D
8miles里面有
多少個1/5mile：8/0.2=40個
所以答案是：3.1+（40-1）*0.4=18.7 
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