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PREP 上做的一道题
A certain library assesses fines for ouver due books as follows. On the first day that a book is overdue, the total fine is $0.1. For each additional day that the book is overdue, the total fine is either increased by $0.3 or doubled, whichever results in the lesser amount. What is the total fine for a book on the fourth day it is over due?
A. 0.6
B. 0.7
C. 0.8
D. 0.9
E. 1.00
正确答案选B,搞不明白啊,我选的E,求大神解答啊!
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