Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack
GMAT Club

 It is currently 28 Mar 2017, 16:44

### 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

# A manufacturer produced x percent more video cameras in 1994 than in

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

### Hide Tags

Manager
Joined: 17 Dec 2005
Posts: 162
Followers: 1

Kudos [?]: 34 [3] , given: 0

A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

16 Jun 2006, 22:35
3
KUDOS
15
This post was
BOOKMARKED
00:00

Difficulty:

55% (hard)

Question Stats:

63% (02:15) correct 37% (01:28) wrong based on 530 sessions

### HideShow timer Statistics

A manufacturer produced x percent more video cameras in 1994 than in 1993 and y percent more in 1995 than in 1994. If the manufacturer produced 1,000 video cameras in 1993, how many video cameras did the manufacturer produce in 1995?

(1) xy = 20
(2) x + y + xy/100 = 9.2
[Reveal] Spoiler: OA

Last edited by Bunuel on 15 Sep 2014, 20:40, edited 3 times in total.
Edited the question.
Director
Joined: 06 May 2006
Posts: 792
Followers: 3

Kudos [?]: 32 [0], given: 2

Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

16 Jun 2006, 23:54
B.

Take,
m = 2003 production
n = 2004 production
p = 2005 production

n = (100 + x)*m/100 -- 1
p = (100 + y)*n/100 -- 2

Substituting 1 in 2,
=> p = (100 + x)(100 + y)*m/(100*100)
=> p = (1 + x/100 + y/100 + xy/10000)*m
=> p = (100 + x + y + xy/100)*m/100

#1. xy = 20

Insufficient; as we get
p = (100 + x + y + 20/100)*m/100 => still have 2 unknowns

#2. x + y + xy/100 = 9.2

Sufficient; as we get
p = (100 + 9.2)*m/100 => no more unknowns

Last edited by paddyboy on 17 Jun 2006, 11:45, edited 2 times in total.
Manager
Joined: 17 Dec 2005
Posts: 162
Followers: 1

Kudos [?]: 34 [1] , given: 0

Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

17 Jun 2006, 11:41
1
KUDOS
B.

Take,
m = 2003 production
n = 2004 production
p = 2005 production

n = (100 + x)*m/100
p = (100 + y)*n/100

=> p = (100 + x)(100 + y)*mn/(100*100)
=> p = (1 + x/100 + y/100 + xy/10000)*mn
=> p = (100 + x + y + xy/100)*mn/100

#1. Insufficient
#2. Sufficient

I got the following:

1993 = m
1994 = n
1995 = p

1994 = ((100+x)/100)m
1995 = ((100+y)/100)n

sub N

1995 = ((100+x)/100)((100+y)/100)m

= ((10000+100x+100y+xy)/10000)m

= ((1+x/100+y/100+xy/10000))m

C1. xy = 20
INSUFFICENT

C2. x+y+xy/100= 9.2
rewritten as

x/100+y/100+xy/10000 = 9.2(1/100)=9.2/100

Thus
subing condition2 into the underlined statement gets me

( 1+ 0.092)m = ??

What happens to m? We just assume its 100.
Current Student
Joined: 18 Jun 2009
Posts: 358
Location: San Francisco
Followers: 10

Kudos [?]: 76 [1] , given: 15

Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

17 Jul 2009, 16:01
1
KUDOS
This is tricky but simple

Lets the number of increase in camera be m for 1993 to 1994

==> m = 1000 * x/100 = 10x

Lets the number of increase in camera be n for 1994 to 1995

==> n = (1000 + 10x) * y/100 = (100 + x) * y/10 = 10y + xy/10

Now the cameras in 1995 = 1000 + a + b = 1000 + 10x + 10y + xy/10 = 10(100+x+y+xy/100)

Now using stmt 2 we can solve the above equation hence Stmt 2 is sufficient and hence answer is B

Note from stmt 1 we wont know values of x and y
VP
Status: Top MBA Admissions Consultant
Joined: 24 Jul 2011
Posts: 1180
GMAT 1: 780 Q51 V48
GRE 1: 1540 Q800 V740
Followers: 128

Kudos [?]: 562 [2] , given: 19

Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

06 Nov 2011, 22:21
2
KUDOS
1
This post was
BOOKMARKED
The question has one critical word missing. Am assuming as follows:
A manufacturer produced x percent more video cameras in 1994 than in 1993 and y percent more in 1995 than in 1994. If he produced 1000 video cameras in 1993, how many did he produce in 1995?

Video cameras produced in 1995 = 1000 * (1+x/100) * (1+y/100)
= 1000 * (1 + x/100 + y/100 + xy/10000) cameras
= 1000 + 1000/100 (x + y + xy/100) cameras
= 1000 + 10 (x + y + xy/100) cameras

Using statement (1), we know xy but not know x and y separately. Insufficient.
Using statement (2), we know x + y + xy/100 and so can calculate the expression above. Sufficient.

(B) it is.
_________________

GyanOne | Top MBA Rankings and MBA Admissions Blog

Top MBA Admissions Consulting | Top MiM Admissions Consulting

Premium MBA Essay Review|Best MBA Interview Preparation|Exclusive GMAT coaching

Get a FREE Detailed MBA Profile Evaluation | Call us now +91 98998 31738

Director
Joined: 29 Nov 2012
Posts: 894
Followers: 15

Kudos [?]: 1130 [1] , given: 543

Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

14 Jul 2013, 03:05
1
KUDOS
1993
1000

1994
$$1000( 1+\frac{x}{100})$$

1995
$$1000(1+\frac{x}{100)}(1+\frac{y}{100})$$

solve for 1995 and take $$\frac{1}{100}$$ common you will get statement 2 sufficient!
_________________

Click +1 Kudos if my post helped...

Amazing Free video explanation for all Quant questions from OG 13 and much more http://www.gmatquantum.com/og13th/

GMAT Prep software What if scenarios http://gmatclub.com/forum/gmat-prep-software-analysis-and-what-if-scenarios-146146.html

GMAT Club Legend
Joined: 09 Sep 2013
Posts: 14493
Followers: 609

Kudos [?]: 174 [0], given: 0

Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

11 Sep 2013, 12:24
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.
_________________
Math Expert
Joined: 02 Sep 2009
Posts: 37659
Followers: 7411

Kudos [?]: 99836 [0], given: 11051

Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

12 Sep 2013, 01:36
Expert's post
1
This post was
BOOKMARKED
Current Student
Status: Everyone is a leader. Just stop listening to others.
Joined: 22 Mar 2013
Posts: 988
Location: India
GPA: 3.51
WE: Information Technology (Computer Software)
Followers: 166

Kudos [?]: 1548 [1] , given: 227

Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

15 Sep 2014, 07:03
1
KUDOS
I got E because of typo made in the question.

Original question :: A manufacturer produced x percent more video cameras in 1994 than in 1993
Typo :: A manufacturer produced x percent ____ video cameras in 1994 than in 1993

Bunuel please edit the question stem, it must be "x percent more"
_________________

Piyush K
-----------------------
Our greatest weakness lies in giving up. The most certain way to succeed is to try just one more time. ― Thomas A. Edison
Don't forget to press--> Kudos
My Articles: 1. WOULD: when to use? | 2. All GMATPrep RCs (New)
Tip: Before exam a week earlier don't forget to exhaust all gmatprep problems specially for "sentence correction".

Math Expert
Joined: 02 Sep 2009
Posts: 37659
Followers: 7411

Kudos [?]: 99836 [0], given: 11051

Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

15 Sep 2014, 20:42
PiyushK wrote:
I got E because of typo made in the question.

Original question :: A manufacturer produced x percent more video cameras in 1994 than in 1993
Typo :: A manufacturer produced x percent ____ video cameras in 1994 than in 1993

Bunuel please edit the question stem, it must be "x percent more"

Thank you! Edited the typo.
_________________
Joined: 28 Nov 2014
Posts: 870
Followers: 12

Kudos [?]: 136 [0], given: 75

Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

07 Jun 2015, 04:42
93 –10^3
94 – 10^3(1+x/100)
95- 10^3(1+y/100)(1+x/100)

To calculate: 10^3 ( 1 + 1/10^2(x + y +xy/10^2))

Clearly B is sufficient
Current Student
Joined: 26 Apr 2015
Posts: 134
Followers: 0

Kudos [?]: 9 [0], given: 134

Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

08 Jun 2015, 23:17
superman wrote:
This is tricky but simple

Lets the number of increase in camera be m for 1993 to 1994

==> m = 1000 * x/100 = 10x

Lets the number of increase in camera be n for 1994 to 1995

==> n = (1000 + 10x) * y/100 = (100 + x) * y/10 = 10y + xy/10

Now the cameras in 1995 = 1000 + a + b = 1000 + 10x + 10y + xy/10 = 10(100+x+y+xy/100)

Now using stmt 2 we can solve the above equation hence Stmt 2 is sufficient and hence answer is B

Note from stmt 1 we wont know values of x and y

hey,
i have a query.
we substituted the value of "xy" in the equation and are left with two unknown variable x and y.
Cant we substitute the value x=20/y also in the equation and make it a single variable equation?
From that we can find the value of x and y separately.
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 14493
Followers: 609

Kudos [?]: 174 [0], given: 0

Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

13 Jun 2016, 18:48
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.
_________________
Senior Manager
Joined: 18 Jan 2010
Posts: 257
Followers: 5

Kudos [?]: 96 [0], given: 9

Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

13 Jun 2016, 22:37
mrmikec wrote:
A manufacturer produced x percent more video cameras in 1994 than in 1993 and y percent more in 1995 than in 1994. If the manufacturer produced 1,000 video cameras in 1993, how many video cameras did the manufacturer produce in 1995?

(1) xy = 20
(2) x + y + xy/100 = 9.2

1993: 1000

1994: 1000*( 1+$$\frac{x}{100}$$)

1995: {1000*( 1+$$\frac{x}{100}$$)} *( 1+$$\frac{y}{100}$$)

value of xy alone would not serve our purpose.

B is sufficient.
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 7255
Location: Pune, India
Followers: 2205

Kudos [?]: 14365 [1] , given: 222

Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink]

### Show Tags

13 Jun 2016, 22:48
1
KUDOS
Expert's post
SonofAnarchy wrote:
superman wrote:
This is tricky but simple

Lets the number of increase in camera be m for 1993 to 1994

==> m = 1000 * x/100 = 10x

Lets the number of increase in camera be n for 1994 to 1995

==> n = (1000 + 10x) * y/100 = (100 + x) * y/10 = 10y + xy/10

Now the cameras in 1995 = 1000 + a + b = 1000 + 10x + 10y + xy/10 = 10(100+x+y+xy/100)

Now using stmt 2 we can solve the above equation hence Stmt 2 is sufficient and hence answer is B

Note from stmt 1 we wont know values of x and y

hey,
i have a query.
we substituted the value of "xy" in the equation and are left with two unknown variable x and y.
Cant we substitute the value x=20/y also in the equation and make it a single variable equation?
From that we can find the value of x and y separately.

For anyone having the same query:

You have xy = 20

Number in 1995 = 1000 * (1 + x/100 + y/100 + xy/10000)

You can put x = 20/y and get:

Number in 1995 = 1000 * ( 1 + 20/100y + y/100 + 20/10000)

What next? We still have an unknown variable y. This is not an equation that will help you solve for y. You need to find the value of the highlighted expression. Also, even if this were an equation, it is likely to give you multiple values of y.

Another thing you can note is that xy = 20 means there are multiple values of x and y possible. e.g. x = 2, y = 10 or x = 4, y = 5 etc.
The value of the expression will change depending on which pair you take since x + y is different in each case.
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for $199 Veritas Prep Reviews Senior Manager Joined: 08 Dec 2015 Posts: 300 GMAT 1: 600 Q44 V27 Followers: 1 Kudos [?]: 16 [0], given: 36 Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink] ### Show Tags 07 Jan 2017, 17:15 How can this be done in 2 minutes?.. The factoring is super difficult. Is this a 600 Q?.. Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 7255 Location: Pune, India Followers: 2205 Kudos [?]: 14365 [0], given: 222 Re: A manufacturer produced x percent more video cameras in 1994 than in [#permalink] ### Show Tags 09 Jan 2017, 08:37 iliavko wrote: How can this be done in 2 minutes?.. The factoring is super difficult. Is this a 600 Q?.. You have to do no factorisation here. Just realise that it is a question involving successive percentage changes. You can calculate that using the formula x + y + xy/100 Stmtn 2 gives you this value. Stmnt 1 gives you xy = 20 only. In this case, x + y can take different values (1+20 or 2+10 or 4+5 etc). So the expression given above will have different values. Check this post for successive percentage changes: https://www.veritasprep.com/blog/2011/0 ... e-changes/ _________________ Karishma Veritas Prep | GMAT Instructor My Blog Get started with Veritas Prep GMAT On Demand for$199

Veritas Prep Reviews

Re: A manufacturer produced x percent more video cameras in 1994 than in   [#permalink] 09 Jan 2017, 08:37
Similar topics Replies Last post
Similar
Topics:
7 Is X percent of Y more than Z percent of W? 2 27 Aug 2014, 06:43
23 If y is greater than 110 percent of x, is y greater than 75 11 17 Jan 2014, 02:29
3 Integers X, Y and Z are greater than zero. Is X percent of Y 8 01 Nov 2010, 15:55
5 If y is greater than 110 percent of x, is y greater than 75? 15 11 Sep 2010, 08:36
1 what percent of y is x? 1) y is 10 more than x divided by 2 3 10 May 2008, 13:00
Display posts from previous: Sort by

# A manufacturer produced x percent more video cameras in 1994 than in

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 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®.