It is currently 27 Jun 2017, 07:43

### 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

Director
Joined: 04 Jan 2008
Posts: 898
Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

23 Apr 2009, 08:58
00:00

Difficulty:

55% (hard)

Question Stats:

22% (03:11) correct 78% (00:45) wrong based on 8 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.

Source : Lsat
[Reveal] Spoiler: OA

_________________

http://gmatclub.com/forum/math-polygons-87336.html
http://gmatclub.com/forum/competition-for-the-best-gmat-error-log-template-86232.html

Senior Manager
Joined: 30 Mar 2009
Posts: 252
Re: Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

23 Apr 2009, 20:07
IMO E

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 --> restating the fact
(B) Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants -->not clearly, but it's intention is weaken
(C) None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants --> if so, then what
(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 -->Assuming that 20 years ago, cost of producing power at traditional plants is X, so cost of producing electric power at photovoltaic plants is < 20X. So, at present, cost of producing electric power at photovoltaic plants is <2X --> make a comparison between <2X and X (increasing), can't reach any conclusion
(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 -->although it seems not too clearly, but it's the best choice. Photovalic continues to decrease, traditional remains or continues to increase, then in long-term, photovalic will be less expensive than traditional
SVP
Joined: 04 May 2006
Posts: 1893
Schools: CBS, Kellogg
Re: Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

23 Apr 2009, 21:30
nitya34 wrote:
12. 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.

D is the best

Nothing controls the cost of producing electric power at photovoltaic plants 20 years ago. The argument must assume something on that cost.
_________________
Intern
Joined: 10 Mar 2009
Posts: 8
Re: Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

24 Apr 2009, 01:52
Director
Joined: 23 May 2008
Posts: 806
Re: Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

24 Apr 2009, 09:09
C

if the new technology can be applied to traditional powerplants, then traditional power plants could be just as cheap or cheaper
Director
Joined: 25 Oct 2006
Posts: 635
Re: Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

24 Apr 2009, 11:43
I was struck between C and D and took lot of time to solve this question.

C - close - talking about "use of technology" and I was considering an extra line of assumption "use of same technology = low cost"
D - - "only cost" is the concern.

IMO D.
_________________

If You're Not Living On The Edge, You're Taking Up Too Much Space

Director
Joined: 04 Jan 2008
Posts: 898
Re: Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

24 Apr 2009, 22:28
ya OA-D
_________________

http://gmatclub.com/forum/math-polygons-87336.html
http://gmatclub.com/forum/competition-for-the-best-gmat-error-log-template-86232.html

Manager
Joined: 08 Apr 2009
Posts: 102
Re: Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

13 May 2009, 15:37
I am surprised OA is A
Manager
Joined: 11 Aug 2008
Posts: 154
Re: Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

29 Oct 2009, 01:29
chill wrote:
I am surprised OA is A

we must focus on what the conclusion of the argument. I am between C and D too, but only D mention about the cost whereas C mention the technology matter
SVP
Joined: 16 Jul 2009
Posts: 1513
Schools: CBS
WE 1: 4 years (Consulting)
Re: Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

16 May 2010, 08:57
chill wrote:
I am surprised OA is A

OA is D, actually.
_________________

The sky is the limit
800 is the limit

GMAT Club Premium Membership - big benefits and savings

Manager
Joined: 16 Feb 2010
Posts: 186
Re: Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

16 May 2010, 16:20
can somebody explain better howcome it is D
Intern
Joined: 12 Oct 2009
Posts: 30
Location: I see you
Re: Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

16 May 2010, 19:13
2
KUDOS
took me 3:30, not acceptable on the GMAT. but here's why I think it's D.

12. 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. (same as conclusion, so this can't be the assumption, although true)
(B) Twenty years ago, traditional power plants were producing 10 times more electric power than were photovoltaic plants. (we don't know anything about how much electric power here, the question is abt cost)
(C) None of the recent technological advances in producing electric power at photovoltaic plants can be applied to producing power at traditional plants. ( None of them can be applied is extreme and we don't know if they can be or cannot be applied, not stated in the argument)
(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.
( For this explanation I drew something like this.
...NOW......................X/10.........................................Y
...20 years ago.............X...........................................??

We don't know what the cost of producing electric power at traditional plants was 20 years ago, but we do know that........X/10 < Y......so...... X<10Y

Answer D is saying X < 20*??, assuming there is not a significant increase from ?? to Y we can say X<20Y which brings us to saying X<10Y<20Y, so definately we can say ...................
..........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. (We don't know about the future so we can't say if this is or will be true.)

Although D is not the best ans it's what is left after POE, once you start elmininating and you think a little, it pops out as a possibility, you don't have to do the mathematical stuff for it. I just did this to give some sort of a explanation.

haven't got a kudo yet, but i heard ppl asking for it, either way, let me know what you think or if there is a better explanation.

_________________

Be willing to fail. It's the price of greatness.

Manager
Joined: 16 Feb 2010
Posts: 186
Re: Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

17 May 2010, 02:49
you need to get kudos for this firang nice & intelligent explanation.
Intern
Joined: 12 Oct 2009
Posts: 30
Location: I see you
Re: Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

17 May 2010, 08:41
Thanks raghav for my first kudo
_________________

Be willing to fail. It's the price of greatness.

GMAT Club Legend
Joined: 01 Oct 2013
Posts: 10148
Re: Photovoltaic power plants produce electricity from sunlight. [#permalink]

### Show Tags

18 May 2014, 01:06
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Re: Photovoltaic power plants produce electricity from sunlight.   [#permalink] 18 May 2014, 01:06
Similar topics Replies Last post
Similar
Topics:
3 Plant Y thrives in environments of great sunlight and very 5 24 Mar 2017, 01:27
25 Most of the power plants dispose of their waste water, used 11 11 Mar 2016, 03:21
14 An electric-power company gained greater profits and 14 17 Jul 2016, 14:10
2 Millions of identical copies of a plant can be produced 6 17 Jul 2016, 13:56
4 An electric-power company gained greater profits and 5 19 Jul 2016, 12:35
Display posts from previous: Sort by