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 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
OA B
Source: GMAT Prep
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 Brent@GMATPrepNow
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1st day  $0.10BTGmoderatorDC wrote: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 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
OA B
Source: GMAT Prep
2nd day  $0.20 or $0.40 (double or add $0.30)
$0.20 is the lesser amount
3rd day  $0.40 or $0.50 (double or add $0.30)
$0.40 is the lesser amount
4th day  $0.80 or $0.70 (double or add $0.30)
$0.70 is the lesser amount
The correct answer is B
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The total fine is increased by $0.30 or doubled, whichever results in a lesser amount  Keep the bolded phrases in mind... it is quite confusing though...
Day 1  $0.10
Day 2 $0.10 *2 or $0.10+$0.30 (Whichever results in a lesser amount), hence its $.20
Day 3  $0.20*2 or $0.20+$0.30, $0.40 as its lesser
Day 4  $0.40*2 or $0.40+$0.30, $0.70 as this is lesser
So, the correct answer is __B__.
Day 1  $0.10
Day 2 $0.10 *2 or $0.10+$0.30 (Whichever results in a lesser amount), hence its $.20
Day 3  $0.20*2 or $0.20+$0.30, $0.40 as its lesser
Day 4  $0.40*2 or $0.40+$0.30, $0.70 as this is lesser
So, the correct answer is __B__.
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 Scott@TargetTestPrep
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BTGmoderatorDC wrote: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 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
OA B
Source: GMAT Prep
On day 1, the fine is $0.10.
On day 2, we have two options:
1) 0.10 + 0.30 = $0.40
2) 0.10 x 2 = $0.20
Since option 2 is the lesser of the 2 fines, the total fine, as of day 2, is $0.20.
On day 3 we have two options:
1) 0.20 + 0.30 = $0.50
2) 0.20 x 2 = $0.40
Since option 2 is the lesser of the 2 fines, the total fine, as of day 3, is $0.40.
On day 4 we have two options:
1) 0.40 + 0.30 = $0.70
2) 0.40 x 2 = $0.80
Since option 1 is the lesser of the 2 fines, the total fine, as of day 4, is $0.70.
Answer: B
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