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# The toll for crossing a certain bridge is \$0.75 each

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Manager
Joined: 17 Jan 2006
Posts: 92

Kudos [?]: 18 [0], given: 0

The toll for crossing a certain bridge is \$0.75 each [#permalink]

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02 May 2006, 03:11
00:00

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Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 2 sessions

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The toll for crossing a certain bridge is \$0.75 each crossing. Drivers who frequently usethe bridge may instead purchase a sticker each month for \$13.00 and then pay only \$0.30 each crossing during that month. If a particular driver will cross the bridge twice on each 10 of x days next month and will not cross the bridge on any other day, what is the least
value of x for which this driver can save money by using the sticker?
A. 14
B. 15
C. 16
D. 28
E. 29

Kudos [?]: 18 [0], given: 0

Director
Joined: 16 Aug 2005
Posts: 937

Kudos [?]: 28 [0], given: 0

Location: France

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02 May 2006, 18:06

Wasn't clear what is meant by "twice on each 10 of x days next month"
I am assuming the driver is crossing the bridge twice for x days in the month (maybe a typo and should be twice on each 1 of x days next month).

By trial and error, start plugging in 16 (because thats the median) for x, then 15, then 14. 15 works!

0.75 * 2 * X compared to 13 + (0.3 * 2 * X)

What have you got?

Kudos [?]: 28 [0], given: 0

VP
Joined: 29 Apr 2003
Posts: 1403

Kudos [?]: 30 [0], given: 0

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03 May 2006, 02:41
I am getting 15

0.65*2*x>13 + 0.3*2*x

Solving for x > 14.xx

which is 15 DAYS.

Kudos [?]: 30 [0], given: 0

Intern
Joined: 07 Apr 2006
Posts: 26

Kudos [?]: 1 [0], given: 0

Location: India

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04 May 2006, 03:03
hi dinesh8

please clear the statement "twice on each 10 of x days "

i will go for the B
_________________

go,get it........

Kudos [?]: 1 [0], given: 0

04 May 2006, 03:03
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