一道PREP 的题

susanyakis

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?  B

(A) $0.60

(B) $0.70

(C) $0.80

(D) $0.90

(E) $1.00

俺对这道的理解有问题.请教各位详细解法,谢谢了

rabbitbugs

1st day 0.1

2 0.2

3 0.4

4 0.7

susanyakis

The total fine is increased by 0.3 or doubled 是什么意思? 如果延期了两天, 这句话的意思是不是 第一天的fine 加第二天的fine 增加0.3 或变成两倍, 还是只是第二天的fine 增加0.3 或多或两倍?

谢谢

nikema

意思是过期罚金或者是每天增加0.3，或者是变为前一天罚金数目的两倍，取两者中较小的一个.

anchorets

很有意思的一道题目,哈哈!

susanyakis

搞了半天是这样的啊，这道题有陷阱, 以后要小心了,谢谢各位!