25.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 答案为B。我选C. |