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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 25 Feb 2008, 00:26
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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 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.

Pls explain
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Re: CR: Photovoltaic power plant [#permalink] New post 25 Feb 2008, 01:20
Conclusion: Photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants.

(A) The cost of producing electric power at traditional plants has increased over the past 20 years. [Fine, but if cost of Photovoltaic power plant’s power production substantially higher than traditional one, then even with one tenth reduction it would still higher than traditional power plant – eliminate it]

(B) Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants. [Irrelevant]

(C) None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants. [Irrelevant as we are dealing with two different technology sectors – eliminate it]

(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. [Hold it]

(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. [Future prediction – eliminate it]

Answer: D
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Re: CR: Photovoltaic power plant [#permalink] New post 25 Feb 2008, 01:50
hanumayamma wrote:
Conclusion: Photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants.

(A) The cost of producing electric power at traditional plants has increased over the past 20 years. [Fine, but if cost of Photovoltaic power plant’s power production substantially higher than traditional one, then even with one tenth reduction it would still higher than traditional power plant – eliminate it]

(B) Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants. [Irrelevant]

(C) None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants. [Irrelevant as we are dealing with two different technology sectors – eliminate it]

(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. [Hold it]

(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. [Future prediction – eliminate it]

Answer: D


Let us say that Twenty years ago, the cost of producing electric power at photovoltaic plants was 19 times ( i.e. less than 20 times) the cost of producing power at traditional plants. Now present cost of producing electric power at photovoltaic plants would still be 1.9 times the cost of producing power at traditional plants. Will the answer D still be correct.
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Re: CR: Photovoltaic power plant [#permalink] New post 25 Feb 2008, 01:54
neelabhmahesh wrote:
hanumayamma wrote:
Conclusion: Photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants.

(A) The cost of producing electric power at traditional plants has increased over the past 20 years. [Fine, but if cost of Photovoltaic power plant’s power production substantially higher than traditional one, then even with one tenth reduction it would still higher than traditional power plant – eliminate it]

(B) Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants. [Irrelevant]

(C) None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants. [Irrelevant as we are dealing with two different technology sectors – eliminate it]

(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. [Hold it]

(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. [Future prediction – eliminate it]

Answer: D


Let us say that Twenty years ago, the cost of producing electric power at photovoltaic plants was 19 times ( i.e. less than 20 times) the cost of producing power at traditional plants. Now present cost of producing electric power at photovoltaic plants would still be 1.9 times the cost of producing power at traditional plants. {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}.Will the answer D still be correct.

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Re: CR: Photovoltaic power plant [#permalink] New post 25 Feb 2008, 02:04
Please factor in the traditional plant's cost - it is increasing. Our analysis of cost was with respect to twenty years.

Now in the example: Photovoltaic power plants are 1.9 times to the cost of traditional plants twenty years ago. But during the 20 years, traditional plants became more expensive. This makes it clear Photovoltaic power plants are economical.
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Re: CR: Photovoltaic power plant [#permalink] New post 25 Feb 2008, 03:20
hanumayamma wrote:
Please factor in the traditional plant's cost - it is increasing. Our analysis of cost was with respect to twenty years.

Now in the example: Photovoltaic power plants are 1.9 times to the cost of traditional plants twenty years ago. But during the 20 years, traditional plants became more expensive. This makes it clear Photovoltaic power plants are economical.


You mean to say that the cost of producing electricity from traditional power plants also would have increased at least twice within 20 years.
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Re: CR: Photovoltaic power plant [#permalink] New post 25 Feb 2008, 08:31
neelabhmahesh wrote:
hanumayamma wrote:
Please factor in the traditional plant's cost - it is increasing. Our analysis of cost was with respect to twenty years.

Now in the example: Photovoltaic power plants are 1.9 times to the cost of traditional plants twenty years ago. But during the 20 years, traditional plants became more expensive. This makes it clear Photovoltaic power plants are economical.


You mean to say that the cost of producing electricity from traditional power plants also would have increased at least twice within 20 years.


I agree with you. It does say that the traditional plants doubled their costs.
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Re: CR: Photovoltaic power plant [#permalink] New post 25 Feb 2008, 21:22
moni77 wrote:
neelabhmahesh wrote:
hanumayamma wrote:
Please factor in the traditional plant's cost - it is increasing. Our analysis of cost was with respect to twenty years.

Now in the example: Photovoltaic power plants are 1.9 times to the cost of traditional plants twenty years ago. But during the 20 years, traditional plants became more expensive. This makes it clear Photovoltaic power plants are economical.


You mean to say that the cost of producing electricity from traditional power plants also would have increased at least twice within 20 years.


I agree with you. It does say that the traditional plants doubled their costs.


But where is this mentioned in the passage
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Re: CR: Photovoltaic power plant [#permalink] New post 25 Feb 2008, 21:41
neelabhmahesh wrote:

I agree with you. It does say that the traditional plants doubled their costs.


But where is this mentioned in the passage[/quote]

Sorry. It's not my day today. I meant it DOESN'T say. So I'm not convinced why D is the correct answer, even if it's better that any other answer choice.
Re: CR: Photovoltaic power plant   [#permalink] 25 Feb 2008, 21:41
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