一道简单数学题。。。

songxuebest

A certain taxi company charges $3.10 for the first of a mile plus $0.40 for each additional   of a mile.  What would this company charge for a taxi ride that was 8 miles long?

(A) $15.60
(B) $16.00
(C) $17.50
(D) $18.70
(E) $19.10

xiruihuang

lz,这题目题干里条件应该不完全，我google了一下，原题是
A certain taxi company charges $3.10 for the first 1/5 of a mile plus .40 for each addtional 1/5 of a mile. What would this company charge for a taxi ride that was 8 miles long?
所以,就很简单拉，答案是D 3.1+[(8-0.2)/0.2 *0.4]