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

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

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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

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Last edited by Bunuel on 25 Jan 2012, 10:55, edited 3 times in total.
Edited the OA, should be C not A

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Re: Difference in Balance [#permalink]

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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.
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Re: Difference in Balance [#permalink]

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New post 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?

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Re: Difference in Balance [#permalink]

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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.

Answer: C.




Hi,

Could you please help me here, Already answer is available in option A so why we have to rule out?


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

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New post 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


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

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New post 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.

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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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