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A certain NYC taxi driver has decided to start charging a

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A certain NYC taxi driver has decided to start charging a [#permalink] New post 29 Oct 2008, 06:29
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A certain NYC taxi driver has decided to start charging a rate of r cents per person per mile. How much, in dollars, would it cost 3 people to travel x miles if he decides to give them a 50% discount?

A) 3xr/2
B) 3x/200r
C) 3r/200x
D) 3xr/200
E) xr/600
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Re: PS : NYC Taxi Driver [#permalink] New post 29 Oct 2008, 06:36
D

Almost stepped into the trap :)

3xr/2 is in cents - 3xr/200 dollars
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Re: PS : NYC Taxi Driver [#permalink] New post 29 Oct 2008, 06:38
r/100 dollars per person per mile

one person going x miles will be charged rx/100
50% discount = rx/200

3such people = 3rx/200
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Re: PS : NYC Taxi Driver [#permalink] New post 29 Oct 2008, 06:42
rate*miles*passangers/discount

discount has to be in dollars so 1/2/100/1=200

rx3/200

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Re: PS : NYC Taxi Driver [#permalink] New post 29 Oct 2008, 08:01
OA is D.

I picked up A :( fell into the trap
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Re: PS : NYC Taxi Driver   [#permalink] 29 Oct 2008, 08:01
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