A certain library assesses fines for overdue books as follows. On the first day that a book is overdue, the total fine is $0.1 For each additional day that the book is overdue, the total fine is either increased by $0.3 or doubled, whichever results in the lesser amount. What is the total fine for a book on the fourth day it is overdue? A 0.6 B0.7 C0.8 d0.9 e1.0
这不写的很明白吗, the total fine is either increased by $0.3 or doubled, whichever results in the lesser amount 就是说,每一天你都按2种算法算一下,去较小的数值 第一天:0.1 第二天:0.2,因为double是0.2,add 0.3就是0.4,取小值 第三天:0.4,(0.2*2 < 0.2+0.3) 第四天:0.7,(0.4+0.3 < 0.4*2)