[求助]PP1-PS-149 (urgent!)

請各位幫忙解釋一下!!謝謝!!

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

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【答案】B