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# The toll for crossing the bridge is \$0.75 each crossing.

Author Message
Manager
Joined: 23 Mar 2008
Posts: 217

Kudos [?]: 200 [0], given: 0

The toll for crossing the bridge is \$0.75 each crossing. [#permalink]

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01 May 2008, 21:28
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

The toll for crossing the 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 thius driver can save money using the sticker?

a) 14
b) 15
c) 16
d) 28
e) 29

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Intern
Joined: 28 Apr 2008
Posts: 15

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01 May 2008, 21:49
I got B:15, as

(.75x)(2) is the cost without sticker
and it must be greater than
13 + (.3x)(2) - cost with sticker *First time I solved, forgot to multiple .3 by two and got way off

so the equation would be:

(.75x)(2) > 13 + (.3x)(2)
1.5x > 13 + .6x
.9x>13
9x>130
x> 14.4444
x=15

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Intern
Joined: 28 Mar 2008
Posts: 34

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02 May 2008, 10:33
1.5X = .6x + 13

x= 130/9

14.4
atleast 15 days to make profit
B

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Re: bridge   [#permalink] 02 May 2008, 10:33
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