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# A certain library assesses fines for overdue books as follows

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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 increased by \$0.30 or doubled, whichever results in a lesser amount. What is the total 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
i approached it and got 0.90. Somehow this answer is wrong but i am unable to understand the approach for the right answer. somebody please help

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In questions like these, whether i am running low on time i prefer to write down the complete answer because i am certain to get these juicy questions correct. The reason probably one can get these questions wrong is probably you try to solve them in your brain ( a cardinal sin ;) )

Day By Doubling By Adding 0.3 Lower Value
1 0.1 NA 0.1
2 0.2 0.4 0.2
3 0.4 0.5 0.4
4 0.8 0.7 0.7

Hence the answer C

answered Jun 15, 2014 by Senior Associate (475 points)
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