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Photovoltaic power plants produce electricity from sunlight.

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 [#permalink] New post 14 Mar 2005, 00:18
I would have chosen C for my first pick because i didnt see any flow in it but it doesn't answer the question about how expensive is the solution... :cry:

(A) The cost of producing electric power at traditional plants has increased over the past 20 years.
we dont know the first cost, we don't know the value of the increase

(B) Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants.
no information about cost

(C) None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants.
no information about cost

(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.
a statement about old situation, no information about now. Even if we cross it with the statement (1/10), we still have no idea about traditional plants cost
(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.
it's expected to decrease further than the current situation. I admit that it seems the only potential choice here but really by elimination process...it doesn't say for how long, it doens't say if the decrease will be always the same, big, small and we just know traditional plans will not increase, however they can never decrease too and stay at their current level...
Anoither thing that would push me for E is also the question : "Thus, photovoltaic power plants offer a less expensive approach to meeting demand for electricity than do traditional power plants"
the term "approach" means that it could be a long vision term strategy....
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 [#permalink] New post 14 Mar 2005, 07:37
ywilfred wrote:
Honghu, I do agree E is not a good choice but referring back to your original post:

"What if P's cost was $1000000 20 years ago and T's cost was only $10? Who's more expensive now?" P cannot cost $100,0000 20 yrs ago and T $10 according to choice (D), since P is only less than 20 times cost of T.


Exactly. D answers my question by limiting P's cost to be less than 20 times cost of T. The other choices do not offer this. This is why D is better than the other choices.
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 [#permalink] New post 14 Mar 2005, 08:40
HongHu wrote:
ywilfred wrote:
Honghu, I do agree E is not a good choice but referring back to your original post:

"What if P's cost was $1000000 20 years ago and T's cost was only $10? Who's more expensive now?" P cannot cost $100,0000 20 yrs ago and T $10 according to choice (D), since P is only less than 20 times cost of T.


Exactly. D answers my question by limiting P's cost to be less than 20 times cost of T. The other choices do not offer this. This is why D is better than the other choices.


Yes. For some obscure reason, I somehow manage to get the math wrong. D indeed tells us a photo plant is more cost-effective. Guess that's a problem when you are trying to solve in a minute and a half :?
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Re: CR -2 [#permalink] New post 15 Mar 2005, 12:50
OA is D. Thanks for the explanation. I think you should coaching people on CRs.


HongHu wrote:
Fact: P's cost is reduced to 1/10 of its original cost. T's cost has increased.
Conclusion: P is less expensive than T.

Ask for assumption.

Clearly it is a leap from the facts to the conclusion. Think about this: How much do they differ in cost originally? What if P's cost was $1000000 20 years ago and T's cost was only $10? Who's more expensive now?

(A) The cost of producing electric power at traditional plants has increased over the past 20 years.
Not enough to answer our question.

(B) Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants.
We are only interested in cost, not quantity of outputs.

(C) None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants.
It doesn't matter. The facts already said that T's cost has increased.

(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.
There, answers our questions perfectly. Of course it would be even better if the number is 10 instead of 20. But as it is now, with the words "less" and the fact that T's increased it's more or less sufficient for this one to provide a rough estimate to suppor the claim.

(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.
Still we can't get to the conclusion that P is less expensive today.

(D)
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easy approach [#permalink] New post 23 Mar 2005, 20:57
any assumption which relates the price of production of electric city at both the plants,,,,,is wht she want!!!!

D only does it!!!! then a quick cheak at the logic provided by D confirms its correctness!
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i hate when people do'nt post the OA, it leaves in guessing!!!!

easy approach   [#permalink] 23 Mar 2005, 20:57
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