Source: Official Guide for the GMAT 13th Ed. Data Sufficiency; #127 Official Guide for the GMAT 2015 14th Ed. Data Sufficiency; #127

1

The annual rent collected by a corporation

The annual rent collected by a corporation from a certain building was x percent more in 1998 than in 1997 and y percent less in 1999 than in 1998. Was the annual rent collected by the corporation from the building more in 1999 than in 1997?

3 Explanations

1

Varun S Nair

For statement 2, since [ 1 + {x-y]/100 + {xy/10,000} ] R > R; and given that (xy/100) < (x-y); I divided both sides by 100 (since dividing by a positive integer won't change the inequality sign).

As a result, I got the same expression we needed: (xy/10,000) < (x-y)/100.

Hope this division by 100 on both sides isn't a violation of some sort of rule for inequalities.

Sep 16, 2019 • Comment

Sam Kinsman, Magoosh Tutor

Hi Varun,
That's perfectly fine and allowed! Good job :D

Sep 16, 2019 • Reply

1

Charles Swartz

At 1:42 into the video, you may have meant to say "less than 100 as a result". Because if it goes up by 20 and down by something greater than 20, it will be less than 100.

Mar 12, 2016 • Comment

Cydney Seigerman, Magoosh Tutor

Hi Chuck! You're completely correct that the explanation should say "less than 100 as a result" at 1:42. While the % decrease from 1998 to 1999 may be less than the % increase from 1997 to 1998, the actual value the rent decreases may still be greater than the actual value the rent increases, and this would result in a final value that is less than the original value (100 in the example in the video).

I've let the content creators know about this, so that the mistake can be correct. However, it may take a while for a new video explanation to be uploaded. In the meantime, your comment will definitely clarify this for the other students who visit this post!

Thanks for pointing this out! :)

Mar 14, 2016 • Reply

2

Gravatar Mike McGarry, Magoosh Tutor

Jan 4, 2014 • Comment

Add Your Explanation

You must have a Magoosh account in order to leave an explanation.

Learn More About Magoosh

Official GMAT Material

Official Guide for GMAT Review 2016

Official Guide for the GMAT 2015 14th Ed.

Official Guide for the GMAT 13th Ed.

Nova's GRE Prep

Official Guide for the GMAT 12th Ed.

Revised GRE PDF 2nd Ed.


Section 6.3 Data Sufficiency

Section 6.3 Data Sufficiency

Improve Your Score

Magoosh GMAT is an affordable online course for studying the GMAT.

Learn More About Magoosh

Share Post

Email

Facebook