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A store reported total sales of $385 million for February of

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A store reported total sales of $385 million for February of [#permalink] New post 07 Dec 2012, 04:31
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A store reported total sales of $385 million for February of this year. If the total sales for the same month last year was $320 million, approximately what was the percent increase in sales?

(A) 2%
(B) 17%
(C) 20%
(D) 65%
(E) 83%
[Reveal] Spoiler: OA
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Re: A store reported total sales of $385 million for February of [#permalink] New post 07 Dec 2012, 04:35
Expert's post
Walkabout wrote:
A store reported total sales of $385 million for February of this year. If the total sales for the same month last year was $320 million, approximately what was the percent increase in sales?

(A) 2%
(B) 17%
(C) 20%
(D) 65%
(E) 83%


Last year's sales = $320 million;
This year's sales = $385 million;
Increase = $65 million.

Now, 20% of $320 million is $64 million, which is very close to actual increase of $65 million.

Answer: C.

OR:
General formula for percent increase or decrease, or percent change:

Percent=\frac{Change}{Original}*100 --> Percent=\frac{65}{320}*100=\frac{13}{64}*100\approx{\frac{13}{65}}*100=20%.

Answer: C.
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Re: A store reported total sales of $385 million for February of [#permalink] New post 15 Dec 2012, 01:45
This might sound stupid, but how do we know that we need to round up 64 to 65 without losing to much time. I did this question before and it took over 2 min before i knew that i had to round 64 to 65 in order to solve the problem. Do you have any trick in mind?
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Re: A store reported total sales of $385 million for February of [#permalink] New post 15 Dec 2012, 04:14
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Shadow88 wrote:
This might sound stupid, but how do we know that we need to round up 64 to 65 without losing to much time. I did this question before and it took over 2 min before i knew that i had to round 64 to 65 in order to solve the problem. Do you have any trick in mind?


65 is the closest multiple of 13: 5*13=65.
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Re: A store reported total sales of $385 million for February of   [#permalink] 15 Dec 2012, 04:14
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