A certain NYC taxi driver has decided to start charging a : GMAT Problem Solving (PS)
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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]

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29 Oct 2008, 05:29
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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
[Reveal] Spoiler: OA

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Re: PS : NYC Taxi Driver [#permalink]

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29 Oct 2008, 05:36
D

Almost stepped into the trap

3xr/2 is in cents - 3xr/200 dollars
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Re: PS : NYC Taxi Driver [#permalink]

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29 Oct 2008, 05:38
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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]

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29 Oct 2008, 05:42
rate*miles*passangers/discount

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

rx3/200

D
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Re: PS : NYC Taxi Driver [#permalink]

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29 Oct 2008, 07:01
OA is D.

I picked up A fell into the trap
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A certain NYC taxi driver [#permalink]

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24 Jun 2015, 05:07
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: A certain NYC taxi driver [#permalink]

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24 Jun 2015, 05:10
I think the correct answer is A
if it is D please inform me why/
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Re: A certain NYC taxi driver [#permalink]

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24 Jun 2015, 05:24
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zahraf wrote:
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

Charge for One person and One mile = r cents
i.e. Charge for 3 persons and One mile = 3*r cents
i.e. Charge for 3 persons and 'x' miles = 3*r*x cents

After Discount, Charge = 50% of (3*r*x) cents
i.e. Charged Amount = (1/2)*(3*r*x) cents

But 1 Dollar = 100 Cents

i.e. Charged Amount in Dollar = (1/2)*(3*r*x)/100 Dollars
i.e. Charged Amount in Dollar = (3*r*x)/200 Dollars

[Reveal] Spoiler:
D

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A certain NYC taxi driver [#permalink]

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24 Jun 2015, 05:25
zahraf wrote:
I think the correct answer is A
if it is D please inform me why/

Hi zahraf

You seem to have missed converting Cents in to Dollars

I hope it helps!
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Re: A certain NYC taxi driver has decided to start charging a [#permalink]

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04 Nov 2015, 13:37
yep...classic trap. I hate when the questions do this! :D
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A certain NYC taxi driver has decided to start charging a [#permalink]

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26 Sep 2016, 10:22
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amitdgr wrote:
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

Here's an algebraic approach:

A certain taxi driver charges a rate of r CENTS per person per mile
r CENTS = r/100 DOLLARS [e.g., 3 cents = 3/100 dollars]
Since there are 3 people, the rate is (3)(r/100) DOLLARS per mile
In other words, the rate is 3r/100 dollars per mile.
With a 50% discount, the new rate = (1/2)(3r/100)
In other words, the discounted rate = 3r/200 dollars per mile.

[how much] would it cost three people to travel x miles?
TOTAL cost = (rate)(distance)
= (3r/200 dollars per mile)(x miles)
= 3rx/200 dollars
=
[Reveal] Spoiler:
D

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Re: A certain NYC taxi driver has decided to start charging a [#permalink]

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26 Sep 2016, 11:08
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amitdgr wrote:
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

Quote:
The taxi driver is charging : At a rate of r cents per person per mile.

So, Charges for 3 people to travel x miles will be : $$3*x*r$$% => $$\frac{3rx}{100}$$

Quote:
he decides to give them a 50% discount

Charges for 3 people to travel x miles will be : $$\frac{3rx}{100} * 50$$% => $$\frac{3rx}{100}*\frac{50}{100}$$ = $$\frac{3xr}{200}$$

So, Answer will be (D) $$\frac{3xr}{200}$$
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Re: A certain NYC taxi driver has decided to start charging a [#permalink]

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11 Dec 2016, 16:22
zahraf wrote:
I think the correct answer is A
if it is D please inform me why/

100 cent equal to 1 dollar. Need to convert it to Dollar means divided by 100
Re: A certain NYC taxi driver has decided to start charging a   [#permalink] 11 Dec 2016, 16:22
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