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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 14 Mar 2008, 06:06
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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 LSAT 5 SEC III N. 6 ASSUMPTIONS [#permalink] New post 14 Mar 2008, 07:33
D

We need to relate them. D gives us a basis in which to do so. Otherwise we could not tell whether one was more expensive, just that one increased and other decreased.
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Re: CR LSAT 5 SEC III N. 6 ASSUMPTIONS [#permalink] New post 14 Mar 2008, 07:37
terp26 wrote:
D

We need to relate them. D gives us a basis in which to do so. Otherwise we could not tell whether one was more expensive, just that one increased and other decreased.


yes OA D
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Re: CR LSAT 5 SEC III N. 6 ASSUMPTIONS [#permalink] New post 14 Mar 2008, 17:30
bouy! that was a tricky one for me.
good one+1
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Re: CR LSAT 5 SEC III N. 6 ASSUMPTIONS   [#permalink] 14 Mar 2008, 17:30
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