Find all School-related info fast with the new School-Specific MBA Forum

It is currently 18 Apr 2014, 10:58

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Photovoltaic power plants produce electricity from sunlight.

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
Joined: 05 Oct 2006
Posts: 271
Followers: 1

Kudos [?]: 3 [0], given: 0

GMAT Tests User
Photovoltaic power plants produce electricity from sunlight. [#permalink] New post 27 Jan 2007, 01:09
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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.
Senior Manager
Senior Manager
Joined: 17 Aug 2005
Posts: 394
Location: Boston, MA
Followers: 1

Kudos [?]: 4 [0], given: 0

GMAT Tests User
Re: cr-Photovoltaic power plants [#permalink] New post 27 Jan 2007, 11:32
D.

Negate the assumption....
If, 20 years ago, photo plants cost MORE than 20 times what traditional plants cost, then they would not necessarily be less expensive now.
Senior Manager
Senior Manager
Joined: 19 Jul 2006
Posts: 363
Followers: 1

Kudos [?]: 1 [0], given: 0

GMAT Tests User
 [#permalink] New post 27 Jan 2007, 17:58
its asking about the asumption, so it should be C or D.

D seems better
Senior Manager
Senior Manager
Joined: 05 Oct 2006
Posts: 271
Followers: 1

Kudos [?]: 3 [0], given: 0

GMAT Tests User
Re: cr-Photovoltaic power plants [#permalink] New post 28 Jan 2007, 21:19
buckkitty wrote:
D.

Negate the assumption....
If, 20 years ago, photo plants cost MORE than 20 times what traditional plants cost, then they would not necessarily be less expensive now.


(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.

LET'S say that 20 years ago, cost of producing electricity at traditional plant =
1 dollar

then 20 years ago, cost of producing electricity at photovoltaic plant = less than 20 dollars

hence today,

cost of producing electricity at photovoltaic plant = less than 2 dollars (as the cost now has become one tenth)

cost of producing electricity at traditional plant has slightly increased,so it may be now slightly more than 1 dollar.

on the basis of abov two,it can not be certainly concluded that the cost at trditional plant is more than that at photovoltaic plants.

hence,i've my reservation about choice D.
Senior Manager
Senior Manager
Joined: 17 Aug 2005
Posts: 394
Location: Boston, MA
Followers: 1

Kudos [?]: 4 [0], given: 0

GMAT Tests User
Re: cr-Photovoltaic power plants [#permalink] New post 29 Jan 2007, 06:56
AK47 wrote:
buckkitty wrote:
D.

Negate the assumption....
If, 20 years ago, photo plants cost MORE than 20 times what traditional plants cost, then they would not necessarily be less expensive now.


(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.

LET'S say that 20 years ago, cost of producing electricity at traditional plant =
1 dollar

then 20 years ago, cost of producing electricity at photovoltaic plant = less than 20 dollars

hence today,

cost of producing electricity at photovoltaic plant = less than 2 dollars (as the cost now has become one tenth)

cost of producing electricity at traditional plant has slightly increased,so it may be now slightly more than 1 dollar.

on the basis of abov two,it can not be certainly concluded that the cost at trditional plant is more than that at photovoltaic plants.

hence,i've my reservation about choice D.


You are right. With the Assumption stated in D. Photo plants may or may not be less expensive. In your example,
Photo is less than 2
Traditional is greater than 1.

The conclusion there is that either could be less expensive. The error in D is that it says was less than 20 times the cost . If it just said was 20 times the cost then I would be more convinced.

But I still think D is the closest, I cannot convince myself that any of the other answer choices are correct.

AK, what is the source? what is the OA?

Last edited by buckkitty on 29 Jan 2007, 07:37, edited 2 times in total.
Manager
Manager
Joined: 14 Oct 2005
Posts: 66
Followers: 1

Kudos [?]: 4 [0], given: 0

 [#permalink] New post 29 Jan 2007, 07:31
D..
Senior Manager
Senior Manager
Joined: 05 Oct 2006
Posts: 271
Followers: 1

Kudos [?]: 3 [0], given: 0

GMAT Tests User
Re: cr-Photovoltaic power plants [#permalink] New post 02 Feb 2007, 07:01
oa is D

source is LSAT.
Re: cr-Photovoltaic power plants   [#permalink] 02 Feb 2007, 07:01
    Similar topics Author Replies Last post
Similar
Topics:
New posts Photovoltaic power plants produce electricity from sunlight. crackgmat3 4 06 Oct 2004, 19:52
Popular new posts Photovoltaic power plants produce electricity from sunlight. harshi 24 11 Mar 2005, 14:45
Popular new posts Photovoltaic power plants produce electricity from sunlight. WinWinMBA 10 11 May 2005, 15:08
Popular new posts Photovoltaic power plants produce electricity from sunlight. remgeo 18 18 May 2006, 07:02
Popular new posts Photovoltaic power plants produce electricity from sunlight. jyotsnasarabu 11 17 Nov 2006, 03:30
Display posts from previous: Sort by

Photovoltaic power plants produce electricity from sunlight.

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.