GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 18 Aug 2018, 03:55

Close

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
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.

Close

Request Expert Reply

Confirm Cancel

A family's savings for a month is calculated by subtracting its total

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

Hide Tags

DS Forum Moderator
avatar
P
Joined: 22 Aug 2013
Posts: 1342
Location: India
Premium Member
A family's savings for a month is calculated by subtracting its total  [#permalink]

Show Tags

New post 21 Jul 2018, 11:03
00:00
A
B
C
D
E

Difficulty:

  85% (hard)

Question Stats:

36% (01:50) correct 64% (02:24) wrong based on 39 sessions

HideShow timer Statistics

A family's savings for a month is calculated by subtracting its total expenditure from its total income, for that particular month. If for every month, family's income is more than its expenditure and if both income and expenditure of this family increased in August over July, then what was the percentage increase in family's savings in August over July?

(1) Family's expenditure in July was 20% less than that in August.

(2) Family's income in August was 25% more than that in July.
Math Expert
User avatar
V
Joined: 02 Aug 2009
Posts: 6548
Re: A family's savings for a month is calculated by subtracting its total  [#permalink]

Show Tags

New post 21 Jul 2018, 19:35
amanvermagmat wrote:
A family's savings for a month is calculated by subtracting its total expenditure from its total income, for that particular month. If for every month, family's income is more than its expenditure and if both income and expenditure of this family increased in August over July, then what was the percentage increase in family's savings in August over July?

(1) Family's expenditure in July was 20% less than that in August.

(2) Family's income in August was 25% more than that in July.


Clearly the statements individually are insufficient as each talks of only one aspect..
Let expenditure in July be x and income be y, so savings will be y-x

1) Be careful on what is the base
So x=80% of August expenditure......X=0.8(August expenditure)
August expenditure=\(\frac{X}{0.8}=10x/8=5x/4=1.25x\)
Nothing about income
Insufficient
2) income in August=1.25y..
Insufficient

Combined..
August expenditure=1.25x
August income=1.25y
Savings in August= 1.25y-1.25x=1.25(y-x)
So savings in August are 25% more than savings in July
Sufficient

C
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


GMAT online Tutor

Re: A family's savings for a month is calculated by subtracting its total &nbs [#permalink] 21 Jul 2018, 19:35
Display posts from previous: Sort by

A family's savings for a month is calculated by subtracting its total

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

Events & Promotions

PREV
NEXT


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.