请教prep数学一题

桔子大

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

D 没看懂 题目 [?]计算中怎么用

formcardiff

这应该是一个错误代码，不是解题条件，这道题不完整。