Photovoltaic power plants produce electricity from sunlight. : GMAT Critical Reasoning (CR)
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# Photovoltaic power plants produce electricity from sunlight.

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Photovoltaic power plants produce electricity from sunlight. [#permalink]

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20 Sep 2009, 05:55
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Photovoltaic power plants produce electricity from sunlight. As a result of astonishing recent technological advances, the cost of producing electric power at photovoltaic power plants, allowing for both construction and operating costs, is one-tenth of what it was 20 years ago, whereas the corresponding cost for traditional plants, which burn fossil fuels, has increased. Thus, photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants.

The conclusion of the argument is properly drawn if which one of the following is assumed?
(A) The cost of producing electric power at traditional plants has increased over the past 20 years.
(B) Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants.
(C) None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants.
(D) Twenty years ago, the cost of producing electric power at photovoltaic plants was less than 10 times the cost of producing power at traditional plants.
(E) The cost of producing electric power at photovoltaic plants is expected to decrease further, while the cost of producing power at traditional plants is not expected to decrease.
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Last edited by lahoosaher on 21 Sep 2009, 13:19, edited 1 time in total.
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Re: CR : Photovoltaic power plants [#permalink]

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20 Sep 2009, 10:19
D IMO. It says that PPP (Photovoltaic Power Plants) cost is decreased to 1/10 of what it was 20 years ago and TPP (Traditional Power Plant) cost has increased. Now what if PPP was like 100 bucks 20 yrs back and now it is 10 bucks. However TPP was 1 buck 20 yrs back and 5 bucks now. Still PPP is decreasing and TPP is increasing but TPP is still less expansive approach. So we need an assumption to prove that PPP is now less expansive than TPP.

amolsk11 wrote:
Photovoltaic power plants produce electricity from sunlight. As a result of astonishing recent technological advances, the cost of producing electric power at photovoltaic power plants, allowing for both construction and operating costs, is one-tenth of what it was 20 years ago, whereas the corresponding cost for traditional plants, which burn fossil fuels, has increased. Thus, photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants.

The conclusion of the argument is properly drawn if which one of the following is assumed?
(A) The cost of producing electric power at traditional plants has increased over the past 20 years.
--> As per the reasoning given in my explanation, PPP can still be cheaper. So this statement doesn't help.
(B) Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants.
--> More electric power is not in question. So out of scope.
(C) None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants.
--> Out of scope.
(D) Twenty years ago, the cost of producing electric power at photovoltaic plants was less than 20 times the cost of producing power at traditional plants.
--> 20 yrs before PPP was less than 1/20 of TPP. And TPP is increasing while PPP is decreasing. So it means that PPP is definitely less expansive than TPP. This is the assumption which helps building the argument.
(E) The cost of producing electric power at photovoltaic plants is expected to decrease further, while the cost of producing power at traditional plants is not expected to decrease.
--> Out of Scope. It does not also tell how much it is expected to decrease.
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Re: CR : Photovoltaic power plants [#permalink]

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20 Sep 2009, 13:32
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IMO "C". The argument falls apart if the advances in technology can help reduce costs for traditional plants.What is the OA?
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Re: CR : Photovoltaic power plants [#permalink]

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21 Sep 2009, 12:25
perfect riteshbindal.
OA D
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Re: CR : Photovoltaic power plants [#permalink]

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21 Sep 2009, 12:50
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Question is posted wrong:
D choice in original question states : 10 times not 20 times.
Reference: Q5 of http://www.lsac.org/pdfs/LSATPreparationweb.pdf

@ritesh:

As per the posted question

D suggests,
20 years ago, PPP(old) < 20 * TPP(old) [* not 1/20 times ]

PPP(now)=1/10th of PPP(old) < 2 * TPP(old)

==> From this, we can't infer that PPP(new) < TPP(new)

as there is no relationship suggesting that TPP(new) > 2 * TPP(old)
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Re: CR : Photovoltaic power plants [#permalink]

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21 Sep 2009, 13:18
sudeep wrote:
Question is posted wrong:
D choice in original question states : 10 times not 20 times.
Reference: Q5 of http://www.lsac.org/pdfs/LSATPreparationweb.pdf

@ritesh:

As per the posted question

D suggests,
20 years ago, PPP(old) < 20 * TPP(old) [* not 1/20 times ]

PPP(now)=1/10th of PPP(old) < 2 * TPP(old)

==> From this, we can't infer that PPP(new) < TPP(new)

as there is no relationship suggesting that TPP(new) > 2 * TPP(old)

Thanks a lot for pointing that out Sudeep.
You are right.

I will correct the question.
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Re: CR : Photovoltaic power plants [#permalink]

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21 Sep 2009, 18:36
After the correction also D will be correct. 1/10 (less than 10 times) will be less than the TPP's current price
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Re: CR : Photovoltaic power plants [#permalink]

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07 May 2010, 05:12
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Lets take another case:
PPP 100 (earlier) >>>>>> 10 (now)
TPP 5 (earlier) >>>>>> 11 (now)

But, this case is not matching D. Can you please check where I am missing?

amolsk11 wrote:
Photovoltaic power plants produce electricity from sunlight. As a result of astonishing recent technological advances, the cost of producing electric power at photovoltaic power plants, allowing for both construction and operating costs, is one-tenth of what it was 20 years ago, whereas the corresponding cost for traditional plants, which burn fossil fuels, has increased. Thus, photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants.

The conclusion of the argument is properly drawn if which one of the following is assumed?
(A) The cost of producing electric power at traditional plants has increased over the past 20 years.
(B) Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants.
(C) None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants.
(D) Twenty years ago, the cost of producing electric power at photovoltaic plants was less than 10 times the cost of producing power at traditional plants.
(E) The cost of producing electric power at photovoltaic plants is expected to decrease further, while the cost of producing power at traditional plants is not expected to decrease.

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Re: CR : Photovoltaic power plants   [#permalink] 07 May 2010, 05:12
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