149.
A certain library assesses fines for overdue books as follows. On the first day that a book is overdue, the total fine is $0.10. For each additional day that the book is overdue, the total fine is either increased by $0.30 or doubled, whichever results in the lesser amount. What is the total fine for a book on the fourth day it is overdue?
(A) $0.60
(B) $0.70
(C) $0.80
(D) $0.90
(E) $1.00
为什么答案是B呢
怎么我算出来就是C呢?
向大家求助,谢谢!
第一天是0.1,第二天要么*2,要么+0.3,以小的为准。
那么第二天就是0.1*2=0.2(而不是0.1+0.3=0.4因为0.4>0.2),第三天就是0.2*2=0.4(而不是0.2+0.3=0.5因为0.4小一点),第四天就是0.4+0.3=0.7(而不是0.4*2=0.8因为0.7小一点)。hope that helps.
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