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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25 Mar 2008, 07:56
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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.
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Re: CR Photovoltaic power plants [#permalink]

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25 Mar 2008, 08:21
(D). The missing assumption is that even though photovoltaic cost 1/20th now vs 20 years ago, it still must be cheaper than traditional.
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Re: CR Photovoltaic power plants [#permalink]

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25 Mar 2008, 16:38
Why not E???
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Re: CR Photovoltaic power plants [#permalink]

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25 Mar 2008, 16:58
I'll go with D - It provides the missing piece...For the conclusion to be true, you have to assume that the cost of producing power 20 yrs ago was less than traditional power plants. OA?
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Re: CR Photovoltaic power plants [#permalink]

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25 Mar 2008, 17:10
shils01 wrote:
Why not E???

Conclusion says "photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants." So, for this to be true we need to assume that the cost of photov power is cheaper. D is the only one that says that.

Choice E doesn't tell us that photovoltaic power plants offer a less expensive approach. It just says "...is expected to decrease further" (further from what?).
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Re: CR Photovoltaic power plants [#permalink]

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25 Mar 2008, 19:55
Vavali 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 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.

C

If tech advances applied in traditional plants, it is not sure that photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants.
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Re: CR Photovoltaic power plants   [#permalink] 25 Mar 2008, 19:55
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