NEW HERE? LEARN MORE
closeclose
Last visit was: 24 Apr 2024, 14:00 It is currently 24 Apr 2024, 14:00
Decision Tracker
My Rewards
New posts
New comers' posts

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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

Price increased by X% from 2001 to 2002 and by Y% from 2002

User avatar
GK_Gmat
Senior Manager
Senior Manager
Joined: 09 Aug 2006
Posts: 351
Own Kudos [?]: 975 [1]
Given Kudos: 0
Send PM
Price increased by X% from 2001 to 2002 and by Y% from 2002 [#permalink] New post   11 Sep 2007, 01:42
1
Bookmarks
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (01:57) correct 0% (00:00) wrong based on 17 sessions
Hide Show timer Statistics
Price increased by X% from 2001 to 2002 and by Y% from 2002 to 2003.
What is the percentage increase from 2001 to 2003?

1) XY=30
2) 100X+100Y+XY=800

Pls. explain. Thanks.



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
Ferihere
Manager
Manager
Joined: 27 Aug 2007
Posts: 125
Own Kudos [?]: 28 [0]
Given Kudos: 0
Send PM
Re: Price increased by X% from 2001 to 2002 and by Y% from 2002 [#permalink] New post   11 Sep 2007, 10:28
It think it is B

2001=a 2002=b 2003=c

(b-a)/a=x

(c-b)/b=y

required to find (c-a)/a = ?

1) insufficient, cause

(b-a)(c-b)/ab = 30 this will not suffice ot derive (c-a)/a

2) sufficient

100*((b(b-a)+a(c-b))/ab+(b-a)(c-b)/ab)=800

when it is suimplified than it becomes

b(c-a)/ab = 8 (c-a)/a = 8

Ans: B
User avatar
mastergmat1
Manager
Manager
Joined: 29 Aug 2007
Posts: 65
Own Kudos [?]: 45 [0]
Given Kudos: 0
Send PM
Re: Price increased by X% from 2001 to 2002 and by Y% from 2002 [#permalink] New post   11 Sep 2007, 11:41
ANswer B

It took me a while to solve the equation with OPtion B

But simplifying it bring it to ( C-a)/a = 8
User avatar
FN
Current Student
Joined: 28 Dec 2004
Posts: 1581
Own Kudos [?]: 642 [1]
Given Kudos: 2
Location: New York City
Concentration: Social Enterprise
Schools:Wharton'11 HBS'12
Send PM
Re: Price increased by X% from 2001 to 2002 and by Y% from 2002 [#permalink] New post   11 Sep 2007, 12:07
1
Bookmarks
B it is..

here is a short cut formula to remember..

if price is increase by x% then by y% the resulting net increase after the successive increments is always (X + Y + XY/100)

in our question below

2) is simply the equation..re-written B is sufficient

It took me about 5 secs to do this..

GK_Gmat wrote:
Price increased by X% from 2001 to 2002 and by Y% from 2002 to 2003.
What is the percentage increase from 2001 to 2003?

1) XY=30
2) 100X+100Y+XY=800

Pls. explain. Thanks.
User avatar
Vlad77
Manager
Manager
Joined: 13 Mar 2007
Posts: 170
Own Kudos [?]: 158 [0]
Given Kudos: 0
Location: Russia, Moscow
Send PM
Re: Price increased by X% from 2001 to 2002 and by Y% from 2002 [#permalink] New post   11 Sep 2007, 12:38
GK_Gmat wrote:
Price increased by X% from 2001 to 2002 and by Y% from 2002 to 2003.
What is the percentage increase from 2001 to 2003?

1) XY=30
2) 100X+100Y+XY=800

Pls. explain. Thanks.


B it is

((x+100)/100)*((y+100)/100)=(10000+100y+100x+xy)/10000
User avatar
ashkrs
Senior Manager
Senior Manager
Joined: 08 Jun 2007
Posts: 285
Own Kudos [?]: 317 [0]
Given Kudos: 0
Send PM
Re: Price increased by X% from 2001 to 2002 and by Y% from 2002 [#permalink] New post   11 Sep 2007, 19:40
GK_Gmat wrote:
Price increased by X% from 2001 to 2002 and by Y% from 2002 to 2003.
What is the percentage increase from 2001 to 2003?

1) XY=30
2) 100X+100Y+XY=800

Pls. explain. Thanks.



B . just a similar question but a bit tough though . this one was simple.
User avatar
bmwhype2
VP
VP
Joined: 21 Jan 2007
Posts: 1346
Own Kudos [?]: 5011 [0]
Given Kudos: 4
Location: New York City
Send PM
Re: Price increased by X% from 2001 to 2002 and by Y% from 2002 [#permalink] New post   21 Nov 2007, 11:04
fresinha12 wrote:
B it is..

here is a short cut formula to remember..

if price is increase by x% then by y% the resulting net increase after the successive increments is always (X + Y + XY/100)

in our question below

2) is simply the equation..re-written B is sufficient

It took me about 5 secs to do this..

GK_Gmat wrote:
Price increased by X% from 2001 to 2002 and by Y% from 2002 to 2003.
What is the percentage increase from 2001 to 2003?

1) XY=30
2) 100X+100Y+XY=800

Pls. explain. Thanks.


how do i rearrange 100X+100Y+XY=800 into the X + Y + (XY/100) format?
User avatar
bmwhype2
VP
VP
Joined: 21 Jan 2007
Posts: 1346
Own Kudos [?]: 5011 [0]
Given Kudos: 4
Location: New York City
Send PM
Re: Price increased by X% from 2001 to 2002 and by Y% from 2002 [#permalink] New post   29 Nov 2007, 13:05
Is there a shortcut for increase - decrease?
User avatar
johnrb
Intern
Intern
Joined: 01 Oct 2007
Posts: 36
Own Kudos [?]: 44 [0]
Given Kudos: 0
Send PM
Re: Price increased by X% from 2001 to 2002 and by Y% from 2002 [#permalink] New post   29 Nov 2007, 16:33
bmwhype2 wrote:
fresinha12 wrote:
B it is..

here is a short cut formula to remember..

if price is increase by x% then by y% the resulting net increase after the successive increments is always (X + Y + XY/100)

in our question below

2) is simply the equation..re-written B is sufficient

It took me about 5 secs to do this..

GK_Gmat wrote:
Price increased by X% from 2001 to 2002 and by Y% from 2002 to 2003.
What is the percentage increase from 2001 to 2003?

1) XY=30
2) 100X+100Y+XY=800

Pls. explain. Thanks.


how do i rearrange 100X+100Y+XY=800 into the X + Y + (XY/100) format?


Divide both sides by 100:

100X + 100Y + XY = 800
X + Y + XY/100 = 8.
User avatar
bumpbot
Non-Human User
Joined: 09 Sep 2013
Posts: 32655
Own Kudos [?]: 821 [0]
Given Kudos: 0
Send PM
Re: Price increased by X% from 2001 to 2002 and by Y% from 2002 [#permalink] New post   06 Feb 2016, 18:34
Hello from the GMAT Club BumpBot!

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.



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
GMAT Club Bot
gmatclubot
Re: Price increased by X% from 2001 to 2002 and by Y% from 2002 [#permalink]
06 Feb 2016, 18:34
Moderators:
Bunuel
Math Expert
92902 posts
yashikaaggarwal
Senior Moderator - Masters Forum
3137 posts
GMATBusters
GMAT Tutor
1905 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions