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A store reported total sales of $385 million for February of  Question banks Downloads My Bookmarks Reviews Important topics Author Message TAGS: Manager Joined: 02 Dec 2012 Posts: 178 Followers: 2 Kudos [?]: 367 [1] , given: 0 A store reported total sales of$385 million for February of [#permalink]  07 Dec 2012, 04:31
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Question Stats:

75% (01:54) correct 25% (01:10) wrong based on 248 sessions
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
Math Expert
Joined: 02 Sep 2009
Posts: 23480
Followers: 3500

Kudos [?]: 26409 [0], given: 2710

Re: A store reported total sales of $385 million for February of [#permalink] 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. _________________ Intern Joined: 06 Jun 2012 Posts: 18 Followers: 0 Kudos [?]: 0 [0], given: 7 Re: A store reported total sales of$385 million for February of [#permalink]  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?
Math Expert
Joined: 02 Sep 2009
Posts: 23480
Followers: 3500

Kudos [?]: 26409 [2] , given: 2710

Re: A store reported total sales of $385 million for February of [#permalink] 15 Dec 2012, 04:14 2 This post received KUDOS Expert's post 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. _________________ Manager Joined: 07 Apr 2014 Posts: 136 Followers: 0 Kudos [?]: 1 [0], given: 76 Re: A store reported total sales of$385 million for February of [#permalink]  11 Sep 2014, 06:09
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= 320
this year = 385

((385-320)/320)*100 = (65/320 )*100 approx.. 20