Photovoltaic power plants produce electricity from sunlight. : GMAT Critical Reasoning (CR)
Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 20 Feb 2017, 00:52

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Photovoltaic power plants produce electricity from sunlight.

Author Message
TAGS:

### Hide Tags

Senior Manager
Joined: 05 Oct 2006
Posts: 267
Followers: 1

Kudos [?]: 17 [0], given: 0

Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

27 Jan 2007, 01:09
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

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.
If you have any questions
New!
Senior Manager
Joined: 17 Aug 2005
Posts: 392
Location: Boston, MA
Followers: 2

Kudos [?]: 94 [0], given: 0

### Show Tags

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
Joined: 19 Jul 2006
Posts: 361
Followers: 2

Kudos [?]: 6 [0], given: 0

### Show Tags

27 Jan 2007, 17:58
its asking about the asumption, so it should be C or D.

D seems better
Senior Manager
Joined: 05 Oct 2006
Posts: 267
Followers: 1

Kudos [?]: 17 [0], given: 0

### Show Tags

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
Joined: 17 Aug 2005
Posts: 392
Location: Boston, MA
Followers: 2

Kudos [?]: 94 [0], given: 0

### Show Tags

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

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
Joined: 14 Oct 2005
Posts: 65
Followers: 1

Kudos [?]: 60 [0], given: 0

### Show Tags

29 Jan 2007, 07:31
D..
Senior Manager
Joined: 05 Oct 2006
Posts: 267
Followers: 1

Kudos [?]: 17 [0], given: 0

### Show Tags

02 Feb 2007, 07:01
oa is D

source is LSAT.
Re: cr-Photovoltaic power plants   [#permalink] 02 Feb 2007, 07:01
Similar topics Replies Last post
Similar
Topics:
4 Photovoltaic power plants produce electricity from sunlight. 7 20 Sep 2009, 05:55
Photovoltaic power plants produce electricity from sunlight. 5 25 Mar 2008, 07:56
1 Photovoltaic power plants produce electricity from sunlight. 3 14 Mar 2008, 06:06
Photovoltaic power plants produce electricity from sunlight. 8 25 Feb 2008, 00:26
3 Photovoltaic power plants produce electricity from sunlight. 20 15 Feb 2008, 14:02
Display posts from previous: Sort by