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

 It is currently 29 May 2017, 22:06

### 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

# Laura sells encyclopaedias, and her monthly income has two

Author Message
Senior Manager
Joined: 29 Jan 2007
Posts: 442
Location: Earth
Followers: 2

Kudos [?]: 63 [0], given: 0

### Show Tags

28 Feb 2007, 12:12
Well well well

Kevincan

In your explanation , If X is your total set sold in March....then you have a bad assumtion that max sets sold is 3 more than 'n' (which is threshold for comission of C per additional set)

I am not sure what correct answer is.
But I feel your approach is incorrect.

I feel it will be great if you can complete your answer
as in give us value of N and C and X and Final answer which is income in March.

Perhaps you are frustrated trying to explain everything....but I do believe there is something missing in your explanation....

I still believe answer is E. :
GMAT Instructor
Joined: 04 Jul 2006
Posts: 1263
Followers: 29

Kudos [?]: 307 [0], given: 0

### Show Tags

28 Feb 2007, 15:40
kyatin wrote:
Well well well

Kevincan

In your explanation , If X is your total set sold in March....then you have a bad assumtion that max sets sold is 3 more than 'n' (which is threshold for comission of C per additional set)

I am not sure what correct answer is.
But I feel your approach is incorrect.

I feel it will be great if you can complete your answer
as in give us value of N and C and X and Final answer which is income in March.

Perhaps you are frustrated trying to explain everything....but I do believe there is something missing in your explanation....

I still believe answer is E. :

If we combine (1) and (2), We don't know the value of n, but we do know that x-n=1, C=600 and thus her income for March was 1600
GMAT Instructor
Joined: 04 Jul 2006
Posts: 1263
Followers: 29

Kudos [?]: 307 [0], given: 0

### Show Tags

28 Feb 2007, 16:02
kwam wrote:
kevincan wrote:
kevincan wrote:
Laura sells encyclopaedias, and her monthly income has two components, a fixed component of $1000, and a variable component of$C for each set of encyclopaedias that she sells in that month over a sales target of n sets, where n>0. How much did she earn in March?

(1) If Laura had sold three fewer sets in March, her income for that month would have been $600 lower than it was. (2) If Laura had sold 10 sets of encyclopaedias in March, her income for that month would have been over$4000.

If Laura sold x sets, there are four cases:
x-n is not postive, in which case her earnings for March were 1000
x-n=1, in which case her earnings for March were 1000+C
x-n=2, in which case her earnings for March were 1000+2C
x-n is at least 3, in which case her earnings for March were 1000+(x-n)C

Man this is def a Q60 question

I understand that from 1 you have that C can be: 600,300 or 200, right?
But alone insuff as is 2 alone.

Taking both together: From 2, putting n=1, we find out that for C=200 or C=300, there is no way to be over $4000 her earnings (maximung of 1000 + 9*200 or 1000 + 9*300). Ok we discovered that C can only be$600, but here is where I get confused. I really do not know how to find the n number so that we could fix the value of her earnings...

You were really close. If C=600, we know that the number of emcycl. she sold was 1 more than n
Senior Manager
Joined: 29 Jan 2007
Posts: 442
Location: Earth
Followers: 2

Kudos [?]: 63 [0], given: 0

### Show Tags

28 Feb 2007, 18:33
Ohhhhhhhhhhhhhhhhhh ok

I get it now...

Sorry to say you were incorrect.

That was a good twister.

You are genious
Director
Joined: 27 May 2008
Posts: 544
Followers: 8

Kudos [?]: 336 [3] , given: 0

### Show Tags

05 Aug 2008, 22:26
3
KUDOS
very good question.... i made it a point not look at solution at second page of thsi thread and tried solving ... after 5 minutes here is what i got

statement 1 : difference is 600
when x is between 1 and n (included) sale = 1000
when x > n sale = 1000 + (x-n)C

x --- sale
n-2---1000
n-1---1000
n ---- 1000
n+1 --- 1000 + C ---- differenec from last 3 = C = 600
n+2 --- 1000 + 2C --- difference from last 3 = 2C = 600. C = 300
n+3 --- 1000 + 3C ---- difference from last 3 = 3C = 600. C = 200
n+4 --- 1000 + 4C ---- difference from last 3 = 3C = 600. C = 200

statement 1 is telling us that C could be 600, 300 or 200 ... not suff

statement : if x = 10, total sale > 4000
variable sale > 3000
(10-n) * C > 3000

Not suff

Combine both

if C = 600
(10-n) * 600 > 3000
10-n > 5
n < 5

if C = 300
(10-n) * 300 > 3000
10-n > 10
n < 0 ... not possible similarly C = 200 is also not possible

possible values of n = 1,2,3,4....
and C = 600,
total number of books sold in march n+1 = 2,3,4,5

here it looks like that we cant answer the question and E is the right answer
but wait a minute... we dont need to find exact n... we only have to find out her total sale in March.. that will be 1000 + C = 1600 Suff

option C
SVP
Joined: 29 Aug 2007
Posts: 2476
Followers: 70

Kudos [?]: 774 [0], given: 19

### Show Tags

06 Aug 2008, 23:02
kevincan wrote:
Laura sells encyclopaedias, and her monthly income has two components, a fixed component of $1000, and a variable component of$C for each set of encyclopaedias that she sells in that month over a sales target of n sets, where n>0. How much did she earn in March?

(1) If Laura had sold three fewer sets in March, her income for that month would have been $600 lower than it was. (2) If Laura had sold 10 sets of encyclopaedias in March, her income for that month would have been over$4000.

good one:

point to be noted: the marginal revenue loss of $600 is for how many copies of encyclopedias? 1 or 2 or 3? remember for : x - n = 1 x - n = 2 x - n = 3 where x = no of copies of encyclopedias sold _________________ Verbal: http://gmatclub.com/forum/new-to-the-verbal-forum-please-read-this-first-77546.html Math: http://gmatclub.com/forum/new-to-the-math-forum-please-read-this-first-77764.html Gmat: http://gmatclub.com/forum/everything-you-need-to-prepare-for-the-gmat-revised-77983.html GT Manager Joined: 21 Feb 2008 Posts: 66 Followers: 3 Kudos [?]: 53 [0], given: 1 Re: DS: Laura's Income [#permalink] ### Show Tags 07 Aug 2008, 04:05 What a ride I too got E. Time to take GMAT more carefully! _________________ Is this okay? VP Joined: 17 Jun 2008 Posts: 1382 Followers: 8 Kudos [?]: 330 [0], given: 0 Re: DS: Laura's Income [#permalink] ### Show Tags 07 Aug 2008, 18:09 kevincan wrote: Laura sells encyclopaedias, and her monthly income has two components, a fixed component of$1000, and a variable component of $C for each set of encyclopaedias that she sells in that month over a sales target of n sets, where n>0. How much did she earn in March? (1) If Laura had sold three fewer sets in March, her income for that month would have been$600 lower than it was.
(2) If Laura had sold 10 sets of encyclopaedias in March, her income for that month would have been over \$4000.

lets say laura sold x sets in march and n is target C is cost per x-n sales
hence (1) 1000+(x-n)*C=1000+(x-3-n)*C+600 INSUFFI since x ,n cannot be evaluated
(2)this says 1000+(10-n)*C >4000 INSUFFI since no clue about what value above 4000

(1) and (2) insuffi hence IMO E
_________________

cheers
Its Now Or Never

GMAT Tutor
Joined: 24 Jun 2008
Posts: 1179
Followers: 438

Kudos [?]: 1606 [0], given: 4

### Show Tags

08 Aug 2008, 17:23
kevincan wrote:
It's my best question!

I wish I'd seen this thread sooner- if you designed this question, nicely done!
(+1)
_________________

GMAT Tutor in Toronto

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com

GMAT Club Legend
Joined: 09 Sep 2013
Posts: 15525
Followers: 651

Kudos [?]: 211 [0], given: 0

Re: Laura sells encyclopaedias, and her monthly income has two [#permalink]

### Show Tags

21 Jun 2016, 00:27
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.
_________________
Re: Laura sells encyclopaedias, and her monthly income has two   [#permalink] 21 Jun 2016, 00:27

Go to page   Previous    1   2   [ 30 posts ]

Display posts from previous: Sort by