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# The toll to pass a bridge is $0.75 for each time. Costing  Question banks Downloads My Bookmarks Reviews Important topics Author Message Intern Joined: 22 Sep 2004 Posts: 28 Followers: 0 Kudos [?]: 17 [0], given: 0 The toll to pass a bridge is$0.75 for each time. Costing [#permalink]  22 Mar 2005, 08:49
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The toll to pass a bridge is $0.75 for each time. Costing$13, you can get a STICKER and with which you would be charged only $0.3 for each time. A person goes across the bridge twice on each of X days every month. If he wants save money by buying a STICKER, what is the least value of X for him? Manager Joined: 11 Jan 2005 Posts: 57 Location: Mexico City Followers: 1 Kudos [?]: 4 [0], given: 0 [#permalink] 22 Mar 2005, 09:45 I got the equation: 13+0.30X= 0.75X which yields 28.89. This means he has to cross the bridge 29 times to save money meaning he has to drive 15 days to save. I get 15. VP Joined: 18 Nov 2004 Posts: 1440 Followers: 2 Kudos [?]: 29 [0], given: 0 [#permalink] 22 Mar 2005, 11:36 1.5X - 0.6X-13 > 0 0.9X > 13 X > 130/9 X > 14 So X = 15 Senior Manager Joined: 07 Oct 2003 Posts: 356 Location: Manhattan Followers: 2 Kudos [?]: 11 [0], given: 0 [#permalink] 29 Mar 2005, 10:43 same reasoning as mentioned above 15 days what's the OA? Manager Joined: 28 Jan 2004 Posts: 200 Location: Ghana Followers: 1 Kudos [?]: 6 [0], given: 0 [#permalink] 04 Apr 2005, 11:12 I'm at a loss here..... how did you guys interpret Costing$13, you can get a STICKER and with which you would be charged only $0.3 for each time Please explain. _________________ It's not over until it's OVER! Manager Joined: 15 Mar 2005 Posts: 230 Followers: 1 Kudos [?]: 0 [0], given: 0 [#permalink] 08 Apr 2005, 09:03 If he buys the sticker, he saves .45 per day...so to save 13 (which is the cost of the sticker), he will have to use the sticker for 13/.9 = 14.4 days = approx 15 days HTH ------------------------------ let there be light Manager Joined: 15 Mar 2005 Posts: 230 Followers: 1 Kudos [?]: 0 [0], given: 0 [#permalink] 08 Apr 2005, 18:21 correction... if he buys the sticker, he will save .45 PER TRIP (and not per day) as mentioned in my previous post....hence the figure 13/.9... cheers! Manager Joined: 07 Mar 2005 Posts: 182 Followers: 1 Kudos [?]: 1 [0], given: 0 [#permalink] 08 Apr 2005, 18:27 i guess it should be 14,,,,becuse it ask for the least ,,,,,, _________________ i hate when people do'nt post the OA, it leaves in guessing!!!! Manager Joined: 17 Dec 2004 Posts: 72 Followers: 2 Kudos [?]: 7 [0], given: 0 [#permalink] 10 Apr 2005, 06:03 I get 15 days... Travel per day without sticker:$1.50
Travel per day with sticker: $0.30 +$13/x

Therefore, in order to determine the point at which the sticker becomes more cost effective: