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# The toll for crossing a certain bridge is $0.75 each  post reply Question banks Downloads My Bookmarks Reviews Important topics Author Message Manager Joined: 03 Oct 2008 Posts: 62 Followers: 0 Kudos [?]: 30 [0], given: 0 The toll for crossing a certain bridge is$0.75 each [#permalink]

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09 Oct 2008, 06:00
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

The toll for crossing a certain bridge is $0.75 each crossing. Drivers who frequently use the 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 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 SVP Joined: 17 Jun 2008 Posts: 1553 Followers: 11 Kudos [?]: 264 [0], given: 0 Re: math---cross the bridge [#permalink] ### Show Tags 10 Oct 2008, 02:43 Not sure whether I understood the question properly. For x days, if the driver uses sticker and if x <=21 then driver will pay$13. But, without sticker, the driver will be 0.75*2*x = 1.5x

In order for the driver to save money, 1.5x > 13 or x > 13/1.5 or x > 8 and the very first answer choice should be the correct answer.
Manager
Joined: 10 Aug 2008
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10 Oct 2008, 03:12
lets take it takes x days for better savings. Than
and each day he crosses twice the bridge
So
0.75(2x) = 13 + 0.3(2x)
=> x = 14.44 days

So least number of days is 15
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10 Oct 2008, 03:16
I agree with Amit on the solution. What is correct answer btw ?
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### Show Tags

10 Oct 2008, 04:22
AmitGUPTA wrote:
lets take it takes x days for better savings. Than
and each day he crosses twice the bridge
So
0.75(2x) = 13 + 0.3(2x)
=> x = 14.44 days

So least number of days is 15