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# From May 1 to May 30 in the same year, the balance in a

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Senior Manager
Joined: 16 Apr 2006
Posts: 271

Kudos [?]: 248 [2], given: 2

From May 1 to May 30 in the same year, the balance in a [#permalink]

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04 Nov 2010, 15:56
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25% (medium)

Question Stats:

73% (00:56) correct 27% (00:56) wrong based on 721 sessions

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From May 1 to May 30 in the same year, the balance in a checking account increased. What was the balance in the checking account on May 30?

(1) If, during this period of time, the increase in the balance in the checking account had been 12 percent, then the balance in the account on May 30 would have been $504 (2) During this period of time, the increase in the balance in the checking account was 8 percent. [Reveal] Spoiler: OA _________________ Trying hard to achieve something unachievable now.... Last edited by Bunuel on 25 Jan 2012, 10:55, edited 3 times in total. Edited the OA, should be C not A Kudos [?]: 248 [2], given: 2 Math Expert Joined: 02 Sep 2009 Posts: 43320 Kudos [?]: 139387 [1], given: 12789 Re: Difference in Balance [#permalink] ### Show Tags 04 Nov 2010, 18:19 1 This post received KUDOS Expert's post 3 This post was BOOKMARKED dkverma wrote: From May 1 to May 30 in the same year, the balance in a checking account increased. What was the balance in the checking account on May 30? (1) If, during this period of time, the increase in the balance in the checking account had been 12 percent, then the balance in the account on May 30 would have been$504
(2) During this period of time, the increase in the balance in the checking account was 8 percent.

Let the balance on May 1 be $$x$$, on May 30 $$y$$ and increase $$p$$ percent.

So $$x*(1+\frac{p}{100})=y$$. Question: $$y=?$$

(1) $$x*(1+\frac{12}{100})=504$$ --> we can find $$x$$, but still not sufficient to get $$y$$.
(2) $$p=8$$. Clearly insufficient.

(1)+(2) We know both $$x$$ and $$p$$ so we can calculate $$y$$. Sufficient.

_________________

Kudos [?]: 139387 [1], given: 12789

Intern
Status: K... M. G...
Joined: 22 Oct 2012
Posts: 48

Kudos [?]: 9 [0], given: 118

GMAT Date: 08-27-2013
GPA: 3.8

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01 Aug 2013, 08:10
Bunuel wrote:
dkverma wrote:
From May 1 to May 30 in the same year, the balance in a checking account increased. What was the balance in the checking account on May 30?
(1) If, during this period of time, the increase in the balance in the checking account had been 12 percent, then the balance in the account on May 30 would have been $504 (2) During this period of time, the increase in the balance in the checking account was 8 percent. Let the balance on May 1 be $$x$$, on May 30 $$y$$ and increase $$p$$ percent. So $$x*(1+\frac{p}{100})=y$$. Question: $$y=?$$ (1) $$x*(1+\frac{12}{100})=504$$ --> we can find $$x$$, but still not sufficient to get $$y$$. (2) $$p=8$$. Clearly insufficient. (1)+(2) We know both $$x$$ and $$p$$ so we can calculate $$y$$. Sufficient. Answer: C. Hi, Could you please help me here, Already answer is available in option A so why we have to rule out? Kudos [?]: 9 [0], given: 118 Verbal Forum Moderator Joined: 10 Oct 2012 Posts: 624 Kudos [?]: 1436 [7], given: 136 Re: Difference in Balance [#permalink] ### Show Tags 01 Aug 2013, 09:46 7 This post received KUDOS 2 This post was BOOKMARKED FTGNGU wrote: Bunuel wrote: dkverma wrote: From May 1 to May 30 in the same year, the balance in a checking account increased. What was the balance in the checking account on May 30? (1) If, during this period of time, the increase in the balance in the checking account had been 12 percent, then the balance in the account on May 30 would have been$504
(2) During this period of time, the increase in the balance in the checking account was 8 percent.

Let the balance on May 1 be $$x$$, on May 30 $$y$$ and increase $$p$$ percent.

So $$x*(1+\frac{p}{100})=y$$. Question: $$y=?$$

(1) $$x*(1+\frac{12}{100})=504$$ --> we can find $$x$$, but still not sufficient to get $$y$$.
(2) $$p=8$$. Clearly insufficient.

(1)+(2) We know both $$x$$ and $$p$$ so we can calculate $$y$$. Sufficient.

Hi,

The question states : "If, during this period of time ....... would have been $504" Note that this statement doesn't give us the actual balance amount. It just gives a condition based on the initial value. For eg, I get a raise in salary, and you want to know my final salary.I tell you that if I had a 20% increase on my salary, it would amount to 120. Thus, you can easily guess that my initial salary = 100. But, do you know the final raise that I got? No. Now, along with the above information, If also tell you that I DID get a 10% hike, you would be able to guess that my final salary = 110. Similar analogy for the above problem. Hope this helped. _________________ Kudos [?]: 1436 [7], given: 136 EMPOWERgmat Instructor Status: GMAT Assassin/Co-Founder Affiliations: EMPOWERgmat Joined: 19 Dec 2014 Posts: 10696 Kudos [?]: 3776 [0], given: 173 Location: United States (CA) GMAT 1: 800 Q51 V49 GRE 1: 340 Q170 V170 Re: From May 1 to May 30 in the same year, the balance in a [#permalink] ### Show Tags 13 Dec 2017, 21:29 Hi All, We're told that from May 1 to May 30 in the same year, the balance in a checking account increased. We're asked for the balance in the checking account on May 30. This question is a great example of a 'concept' question, meaning that you don't have to do any actual math to solve it (as long as you recognize the concepts involved). 1) If, during this period of time, the increase in the balance in the checking account had been 12 percent, then the balance in the account on May 30 would have been$504

Fact 1 gives us a 'hypothetical' situation, that allows us to create the following equation:
(1.12)(May 1st balance) = $504 We can use this information to figure out the initial balance on May 1st, but since we don't know that ACTUAL increase in the balance of the account, we cannot determine the total in the account on May 30th. Fact 1 is INSUFFICIENT 2) During this period of time, the increase in the balance in the checking account was 8 percent. Fact 2 gives us the (percent) increase in the balance of the account, but we still don't know the ending balance on May 30th. Fact 2 is INSUFFICIENT Combined, we know: -The balance on May 1st -The balance increased by 8% from May 1st to May 30th With this information, we CAN calculate the balance on May 30th (but we don't actually have to do any of the individual math 'steps' to know that). Final Answer: [Reveal] Spoiler: C GMAT assassins aren't born, they're made, Rich _________________ 760+: Learn What GMAT Assassins Do to Score at the Highest Levels Contact Rich at: Rich.C@empowergmat.com # Rich Cohen Co-Founder & GMAT Assassin Special Offer: Save$75 + GMAT Club Tests Free
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Kudos [?]: 3776 [0], given: 173

Manager
Joined: 02 Jan 2017
Posts: 90

Kudos [?]: 2 [0], given: 23

Location: Pakistan
Concentration: Finance, Technology
GMAT 1: 650 Q47 V34
GPA: 3.41
Re: From May 1 to May 30 in the same year, the balance in a [#permalink]

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15 Dec 2017, 07:08
The only point that is crucial to get this Question right is that [ IF ] in Statement 1, 504 is not the balance at may 30 but it would be the balance if A certain amount X is increased at 12 % .

We use Statment 1 to get Amount X But we do not have the actual increase in amount, it is insufficient
We use Statement 2 to apply the actual increment We have the actual increase but not the amount, it is insufficient

Hence we have to use Both statements , therefore answer is C.

Kudos [?]: 2 [0], given: 23

Re: From May 1 to May 30 in the same year, the balance in a   [#permalink] 15 Dec 2017, 07:08
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