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by joanjgonzalez » Wed Dec 17, 2008 8:41 am
Hey guys, can anybody help me with this one?

The cost of a taxi ride is $1.20 for the first quarter mile and $0.40 for each succeding quarter mile. What is the cost in dollars for a taxi ride of m miles?

a. 1.20+1.60m
b. 0.80+1.60m
c. 0.80+0.40m
d. 1.60m-0.40
e. 1.60m-1.20

IMO is
[spoiler]b

Thanks![/spoiler]
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by Brent@GMATPrepNow » Wed Dec 17, 2008 8:53 am
For me, the easiest way is to simply ignore the part about "$1.20 for the first quarter mile."

If we ignore this, we can see that it costs $1.60 for every mile (or 1.60m)
But of course, we can't just leave out that part.

Our answer so far of 1.60m doesn't take into account the fact that the first 1/4 mile costs more than the subsequent 1/4 miles.
How much more? $0.80 more.
So, we need to add that to our current total
We get 1.6m + 0.8 (B)
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by mrsmarthi » Wed Dec 17, 2008 8:23 pm
Brent Hanneson wrote:For me, the easiest way is to simply ignore the part about "$1.20 for the first quarter mile."

If we ignore this, we can see that it costs $1.60 for every mile (or 1.60m)
But of course, we can't just leave out that part.

Our answer so far of 1.60m doesn't take into account the fact that the first 1/4 mile costs more than the subsequent 1/4 miles.
How much more? $0.80 more.
So, we need to add that to our current total
We get 1.6m + 0.8 (B)
Tha't a cool way of solving the problem in shorter time. These are type of tricks we learn from Beat The GMAT. Thanks :)
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by msd_2008 » Thu Dec 18, 2008 3:50 am
I didn't understand how did you arrive at the $1.60 per mile figure. The question says that $1.20 for first quarter mile and $0.40 for each succeeding quarter mile......i think this means that 1.20x1 + 3x0.40 (because there are 3 more quarters in the one mile) = 1.20 + 1.20 = $2.40 per mile and hence for m miles it will be $2.40 m

Can you please correct my understanding?

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MSD
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by dmateer25 » Thu Dec 18, 2008 6:46 am
It only costs 1.20 for the FIRST quarter mile.

Not for each first quarter mile of every succeeding mile.
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by msd_2008 » Thu Dec 18, 2008 10:43 pm
Thanks Dmateer.....got it.
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by msd_2008 » Thu Dec 18, 2008 11:30 pm
Thanks Dmateer.....got it.
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