prep1－149，脑子转不过弯了

lucyloveandy

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

我想问问increased by是增加到，还是增加了，那increase to又是什么意思呢？

assurance

increase by是增加了，increase to是增加到。

lucyloveandy

谢谢，但是为何这道题答案为B啊？

freedownload

1     2      3      4

0.1   0.2    0.4    0.7

lucyloveandy

请问，不是每天增加了0.3吗？那就应该是

1      2      3     4

0.1   0.4    0.7    1

detectiveyang

題目有說不是double就是增加0.3,然後找最小的算喔!

lucyloveandy

懂了，懂了，我没把“不是double就是增加0.3,然後找最小的算”想明白，现在脑子通了，谢谢大家了！