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Photovoltaic power plants produce electricity from sunlight.

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Photovoltaic power plants produce electricity from sunlight. [#permalink] New post 23 Apr 2009, 07:58
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

40% (03:11) correct 60% (01:47) wrong based on 2 sessions
12. 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 20 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-LSAT [#permalink] New post 23 Apr 2009, 19:07
IMO E

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 --> restating the fact
(B) Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants -->not clearly, but it's intention is weaken
(C) None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants --> if so, then what
(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 -->Assuming that 20 years ago, cost of producing power at traditional plants is X, so cost of producing electric power at photovoltaic plants is < 20X. So, at present, cost of producing electric power at photovoltaic plants is <2X --> make a comparison between <2X and X (increasing), can't reach any conclusion
(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 -->although it seems not too clearly, but it's the best choice. Photovalic continues to decrease, traditional remains or continues to increase, then in long-term, photovalic will be less expensive than traditional
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Re: CR-LSAT [#permalink] New post 23 Apr 2009, 20:30
nitya34 wrote:
12. 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 20 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.


D is the best

Nothing controls the cost of producing electric power at photovoltaic plants 20 years ago. The argument must assume something on that cost.
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Re: CR-LSAT [#permalink] New post 24 Apr 2009, 00:52
E is the answer.
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Re: CR-LSAT [#permalink] New post 24 Apr 2009, 08:09
C

if the new technology can be applied to traditional powerplants, then traditional power plants could be just as cheap or cheaper
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Re: CR-LSAT [#permalink] New post 24 Apr 2009, 10:43
I was struck between C and D and took lot of time to solve this question.

C - close - talking about "use of technology" and I was considering an extra line of assumption "use of same technology = low cost"
D - :o - "only cost" is the concern.

IMO D.
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Re: CR-LSAT [#permalink] New post 24 Apr 2009, 21:28
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Re: CR-LSAT [#permalink] New post 13 May 2009, 14:37
I am surprised OA is A
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Re: CR-LSAT [#permalink] New post 29 Oct 2009, 00:29
chill wrote:
I am surprised OA is A

we must focus on what the conclusion of the argument. I am between C and D too, but only D mention about the cost whereas C mention the technology matter
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Re: CR-LSAT [#permalink] New post 16 May 2010, 07:57
chill wrote:
I am surprised OA is A


OA is D, actually.
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Re: CR-LSAT [#permalink] New post 16 May 2010, 15:20
can somebody explain better howcome it is D
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Re: CR-LSAT [#permalink] New post 16 May 2010, 18:13
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took me 3:30, not acceptable on the GMAT. but here's why I think it's D.

12. 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. (same as conclusion, so this can't be the assumption, although true)
(B) Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants. (we don't know anything about how much electric power here, the question is abt cost)
(C) None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants. ( None of them can be applied is extreme and we don't know if they can be or cannot be applied, not stated in the argument)
(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.
( For this explanation I drew something like this.
........................photovoltaic plant (PP)..............Traditional plant (TP)
...NOW......................X/10.........................................Y
...20 years ago.............X...........................................??

We don't know what the cost of producing electric power at traditional plants was 20 years ago, but we do know that........X/10 < Y......so...... X<10Y

Answer D is saying X < 20*??, assuming there is not a significant increase from ?? to Y we can say X<20Y which brings us to saying X<10Y<20Y, so definately we can say ...................
..........cost of producing electric power at photovoltaic plants was less than 20 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. (We don't know about the future so we can't say if this is or will be true.)

Although D is not the best ans it's what is left after POE, once you start elmininating and you think a little, it pops out as a possibility, you don't have to do the mathematical stuff for it. I just did this to give some sort of a explanation.

haven't got a kudo yet, but i heard ppl asking for it, either way, let me know what you think or if there is a better explanation.

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Re: CR-LSAT [#permalink] New post 17 May 2010, 01:49
you need to get kudos for this firang nice & intelligent explanation.
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Re: CR-LSAT [#permalink] New post 17 May 2010, 07:41
Thanks raghav for my first kudo :)
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Re: Photovoltaic power plants produce electricity from sunlight. [#permalink] New post 18 May 2014, 00:06
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Photovoltaic power plants produce electricity from sunlight.   [#permalink] 18 May 2014, 00:06
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