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.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Last year the average (arithmetic mean) salary of the 10 [#permalink]

Show Tags

02 Dec 2006, 07:07

1

This post received KUDOS

3

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

25% (medium)

Question Stats:

68% (01:47) correct
32% (00:43) wrong based on 294 sessions

HideShow timer Statistics

Last year the average (arithmetic mean) salary of the 10 employees of Company X was $42,800. What is the average salary of the same 10 employees this year?

1) For 8 of the 10 employees, this year's salary is 15 percent greater than last year's salary. 2) For 2 of the 10 employees, this year's salary is the same as last year's salary.

Re: Last year the average (arithmetic mean) salary of the 10 [#permalink]

Show Tags

02 Dec 2006, 07:21

E for me

From 1) Depending on which two employees didn't get 15% increase would affect the overall total. Eg if top two salaries didn't get the 15% increase then it would yield a lower total and hence average than if the bottom two salaries didn't get a 15% increase. INSUFF

From 2) This tells us even less than 1). What % change in salary did others get? Which two salaries didn't get increase? INSUFF

Together,
Still dont know which two employees didn't get increase and the respective salaries of the others.

Re: Last year the average (arithmetic mean) salary of the 10 [#permalink]

Show Tags

02 Dec 2006, 07:23

Can you please explain why? From statement 1 wouldn't you know that for 8 of the 10 employees, the salary is now $49,220 (42,800 * 1.15)...and from statement 2 you would know that the salary of the remaining 2 is (still) 42,800? Thus you could do:

(49220*8) + (42800*2)
--------------------------- = average salary
10

..and thus the answer would be C. How is that wrong?

Re: Last year the average (arithmetic mean) salary of the 10 [#permalink]

Show Tags

02 Dec 2006, 07:27

aurobindo wrote:

Straight E.

If they were to mention in the second statement that, these 2 are excluding those 8, then something is possible.

It still wouldn't help - taking both together we know that 8 got 15% increase but 2 got no increase (or loss). However, we'd still need to know where in the range of salaries those two employees were.

Eg.
Take a set of numbers 2,3,5,6 Mean = 4

If you double the lowest 3 numbers you get 4,6,10,6 Mean = 6.5
If you double the highest 3 numbers you get 2,6,10,12 Mean = 7.5

So simply knowing that x number of employees got/didn't get an increase doesn't help

Re: Last year the average (arithmetic mean) salary of the 10 [#permalink]

Show Tags

02 Dec 2006, 07:30

Last year the average (arithmetic mean) salary of the 10 employees of Company X was $42,800. What is the average salary of the same 10 employees this year?

1) For 8 of the 10 employees, this year's salary is 15 percent greater than last year's salary.

2) For 2 of the 10 employees, this year's salary is the same as last year's salary.

Re: Last year the average (arithmetic mean) salary of the 10 [#permalink]

Show Tags

19 Apr 2010, 18:15

I'm really sorry to bump such an old thread but qant to play devil's advocate with this question. If statement 2 stated that the lowest two salaries of the ten employees stayed the same, then the both of the statements together would be sufficient correct?

The average of the salaries would be ((42800*2)+(1.15*42800*8))/10= 47936

Re: Last year the average (arithmetic mean) salary of the 10 [#permalink]

Show Tags

20 Apr 2010, 12:26

You have no information on what the lowest 2 salaries were, just that the average was 42,800. What you assumed was the extra information tells us that the two lowest salaries stayed the same is not equivalent to they were the average values.

Re: Last year the average (arithmetic mean) salary of the 10 [#permalink]

Show Tags

04 Oct 2015, 12:29

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.
_________________

Last year the average (arithmetic mean) salary of the 10 employees of Company X was $42,800. What is the average salary of the same 10 employees this year?

1) For 8 of the 10 employees, this year's salary is 15 percent greater than last year's salary. 2) For 2 of the 10 employees, this year's salary is the same as last year's salary.

Last year the average (arithmetic mean) salary of the 10 employees of Company X was $42,800. What is the average salary of the same 10 employees this year?

(1) For 8 of the 10 employees, this year’s salary is 15 percent greater than last year’s salary. (2) For 2 of the 10 employees, this year’s salary is the same as last year’s salary.

Given: total salary is $42,800*10. Question: new total salary=?

Each statement together is not sufficient.

When taken together. Consider two possible cases: 2 lowest salaries didn't change and 8 highest salaries increased by 15%; 2 highest salaries didn't change and 8 lowest salaries increased by 15%;

Ask yourself, would new total salary be the same for both cases? No, because increase in amount for the first case will be more than increase in amount for the second case. Hence even taken together statements are not sufficient.

Happy New Year everyone! Before I get started on this post, and well, restarted on this blog in general, I wanted to mention something. For the past several months...

It’s quickly approaching two years since I last wrote anything on this blog. A lot has happened since then. When I last posted, I had just gotten back from...

Happy 2017! Here is another update, 7 months later. With this pace I might add only one more post before the end of the GSB! However, I promised that...

The words of John O’Donohue ring in my head every time I reflect on the transformative, euphoric, life-changing, demanding, emotional, and great year that 2016 was! The fourth to...