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, sales at Company X were 10% greater in February than in Jan [#permalink]

Show Tags

24 Apr 2016, 23:36

3

This post received KUDOS

12

This post was BOOKMARKED

00:00

A

B

C

D

E

Difficulty:

45% (medium)

Question Stats:

69% (01:08) correct
31% (01:21) wrong based on 404 sessions

HideShow timer Statistics

Last year, sales at Company X were 10% greater in February than in January, 15% less in March than in Feb, 20% greater in April than in March, 10% less in May than in April, and 5% greater in June than in May. In which month were sales closest to Jan?

Last year, sales at Company X were 10% greater in February than in Jan [#permalink]

Show Tags

25 Apr 2016, 02:37

happyface101 wrote:

Last year, sales at Company X were 10% greater in February than in January, 15% less in March than in Feb, 20% greater in April than in March, 10% less in May than in April, and 5% greater in June than in May. In which month were sales closest to Jan?

a. Feb b. Mar c. Apr d. May e. June

What's the easiest / quickest way to solve this?

Find the missing link ( Much like Darwin's missing link )

Quote:

10% greater in February than in January 15% less in March than in Feb 20% greater in April than in March 10% less in May than in April 5% greater in June than in May

Can you find the link ? Yes you are correct, sales of next month depends on the sale of This month............

So, Assume Sales in Jan as 1000 or x as you wish and proceed.....

Abhishek

PS : This is a calculation intensive Problem and will result in decimal numbers so, it will be better to assume the sales figure of Jan as X and solve algebraically ( My personal Opinion) _________________

Thanks and Regards

Abhishek....

PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS

Last year, sales at Company X were 10% greater in February than in Jan [#permalink]

Show Tags

28 Apr 2016, 14:16

5

This post received KUDOS

4

This post was BOOKMARKED

This can be solved using smart numbers: Let January = $100. (Keep in mind we are using "approximate" values, as per the problem). We have: Jan = $100 10% greater in February than in January ---> Feb = 1.1 Jan = $110 15% less in March than in Feb ---> Mar = 0.85 Feb = $93.5 20% greater in April than in March ---> Apr = 1.2 Mar = $112 10% less in May than in April ---> May = 0.9 Apr = $101 (we have a winner) 5% greater in June than in May --->Jun = 1.05 May = $106

Last year, sales at Company X were 10% greater in February than in January, 15% less in March than in Feb, 20% greater in April than in March, 10% less in May than in April, and 5% greater in June than in May. In which month were sales closest to Jan?

a. Feb b. Mar c. Apr d. May e. June

What's the easiest / quickest way to solve this?

You can do this question easily if you understand number properties. Let me try to explain. Note that explaining takes quite a bit of time though if you understand this, thinking through doesn't take more than a few seconds:

There is an increase, then a decrease, then an increase, then a decrease and an increase again. Most probably, when you apply an increase and then a decrease, the figure will come back close to its original value. So March or May are the best bets.

The first iteration (Feb-March) will take it much lower since after you increase by 10%, you are decreasing by a number greater than 10%. Actually, to come back to original, you need to decrease by a number slightly smaller than 10%. Take an example: original value = 100 Increase by 10% to get 110. Now if you decrease it by about 9%, you will get 100 back. But you actually decrease by 15% so it goes down. So March is unlikely.

Next iteration is April-May. You increase a number smaller than 100 by 20% and then bring it down by 10%. This should be the answer in all probability. Though 20% seems like a big increase compared to the 10% decrease so it looks like the figure might be much greater than original but the next step (5% increase) is a further increase so June is anyway not possible. Just to be sure, let's see the effect of these 4 operations on the original value: (11/10)*(17/20)*(6/5)*(9/10) = (99/100)*(102/100) (club together first and last terms to get 99/100 and second and third terms to get 102/100) This would be extremely close to 1.

Re: Last year, sales at Company X were 10% greater in February than in Jan [#permalink]

Show Tags

21 Jul 2016, 04:35

VeritasPrepKarishma wrote:

happyface101 wrote:

Last year, sales at Company X were 10% greater in February than in January, 15% less in March than in Feb, 20% greater in April than in March, 10% less in May than in April, and 5% greater in June than in May. In which month were sales closest to Jan?

a. Feb b. Mar c. Apr d. May e. June

What's the easiest / quickest way to solve this?

You can do this question easily if you understand number properties. Let me try to explain. Note that explaining takes quite a bit of time though if you understand this, thinking through doesn't take more than a few seconds:

There is an increase, then a decrease, then an increase, then a decrease and an increase again. Most probably, when you apply an increase and then a decrease, the figure will come back close to its original value. So March or May are the best bets.

The first iteration (Feb-March) will take it much lower since after you increase by 10%, you are decreasing by a number greater than 10%. Actually, to come back to original, you need to decrease by a number slightly smaller than 10%. Take an example: original value = 100 Increase by 10% to get 110. Now if you decrease it by about 9%, you will get 100 back. But you actually decrease by 15% so it goes down. So March is unlikely.

Next iteration is April-May. You increase a number smaller than 100 by 20% and then bring it down by 10%. This should be the answer in all probability. Though 20% seems like a big increase compared to the 10% decrease so it looks like the figure might be much greater than original but the next step (5% increase) is a further increase so June is anyway not possible. Just to be sure, let's see the effect of these 4 operations on the original value: (11/10)*(17/20)*(6/5)*(9/10) = (99/100)*(102/100) (club together first and last terms to get 99/100 and second and third terms to get 102/100) This would be extremely close to 1.

So answer would be May.

Answer (D)

Why do we club 2nd and 3rd ?

(11/10)*(17/20)*(6/5)*(9/10) = (99/100)*(102/100) (club together first and last terms to get 99/100 and second and third terms to get 102/100)

Last year, sales at Company X were 10% greater in February than in January, 15% less in March than in Feb, 20% greater in April than in March, 10% less in May than in April, and 5% greater in June than in May. In which month were sales closest to Jan?

a. Feb b. Mar c. Apr d. May e. June

What's the easiest / quickest way to solve this?

You can do this question easily if you understand number properties. Let me try to explain. Note that explaining takes quite a bit of time though if you understand this, thinking through doesn't take more than a few seconds:

There is an increase, then a decrease, then an increase, then a decrease and an increase again. Most probably, when you apply an increase and then a decrease, the figure will come back close to its original value. So March or May are the best bets.

The first iteration (Feb-March) will take it much lower since after you increase by 10%, you are decreasing by a number greater than 10%. Actually, to come back to original, you need to decrease by a number slightly smaller than 10%. Take an example: original value = 100 Increase by 10% to get 110. Now if you decrease it by about 9%, you will get 100 back. But you actually decrease by 15% so it goes down. So March is unlikely.

Next iteration is April-May. You increase a number smaller than 100 by 20% and then bring it down by 10%. This should be the answer in all probability. Though 20% seems like a big increase compared to the 10% decrease so it looks like the figure might be much greater than original but the next step (5% increase) is a further increase so June is anyway not possible. Just to be sure, let's see the effect of these 4 operations on the original value: (11/10)*(17/20)*(6/5)*(9/10) = (99/100)*(102/100) (club together first and last terms to get 99/100 and second and third terms to get 102/100) This would be extremely close to 1.

So answer would be May.

Answer (D)

Why do we club 2nd and 3rd ?

(11/10)*(17/20)*(6/5)*(9/10) = (99/100)*(102/100) (club together first and last terms to get 99/100 and second and third terms to get 102/100)

You don't have to - you can to help you in your calculation. The denominators multiply to give 100. The numerator is something very close to 100. So you know that by clubbing, you can easily approximate.
_________________

Re: Last year, sales at Company X were 10% greater in February than in Jan [#permalink]

Show Tags

24 Jul 2017, 08:49

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.
_________________

Don't calculate June - obviously, if \($10,098\) gets larger, then it's farther from \($10,000\) than May. The important piece here is being able to quickly do calculations with numbers in base-10. You should know shortcuts for these operations, or GMAT estimation questions will frustrate you and devour the clock.

Re: Last year, sales at Company X were 10% greater in February than in Jan [#permalink]

Show Tags

01 Sep 2017, 18:49

Let the sales is May is 100. Then June sell = 100+5=105 April sell=100+10=110 March sell=110-20=90 Feb sell=90+15=105 Jan sell=105-15=90. Hence, January sell is near to May sell.

We’ve given one of our favorite features a boost! You can now manage your profile photo, or avatar , right on WordPress.com. This avatar, powered by a service...

Sometimes it’s the extra touches that make all the difference; on your website, that’s the photos and video that give your content life. You asked for streamlined access...

A lot has been written recently about the big five technology giants (Microsoft, Google, Amazon, Apple, and Facebook) that dominate the technology sector. There are fears about the...

Post today is short and sweet for my MBA batchmates! We survived Foundations term, and tomorrow's the start of our Term 1! I'm sharing my pre-MBA notes...