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PS - % (m02q37)

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PS - % (m02q37) [#permalink]  23 Jan 2008, 08:46
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A number of light bulbs were purchased to illuminate a gym. However, only \normal\frac{2}{3} of them were needed. The extra 160 light bulbs were returned. 60% percent of their cost, or $96, was reimbursed. How much money was spent on illuminating the gym? (A) 360 (B) 320 (C) 384 (D) 364 (E) 160 [Reveal] Spoiler: OA C Source: GMAT Club Tests - hardest GMAT questions [Reveal] Spoiler: OA _________________ Welcome to GMAT Club! Want to solve GMAT questions on the go? GMAT Club iPhone app will help. Please read this before posting in GMAT Club Tests forum Result correlation between real GMAT and GMAT Club Tests Are GMAT Club Test sets ordered in any way? Take 15 free tests with questions from GMAT Club, Knewton, Manhattan GMAT, and Veritas. Find out what's new at GMAT Club - latest features and updates  Kaplan GMAT Prep Discount Codes Knewton GMAT Discount Codes GMAT Pill GMAT Discount Codes CEO Joined: 17 Nov 2007 Posts: 3594 Concentration: Entrepreneurship, Other Schools: Chicago (Booth) - Class of 2011 GMAT 1: 750 Q50 V40 Followers: 230 Kudos [?]: 1299 [1] , given: 346 Re: PS - % [#permalink] 23 Jan 2008, 08:57 1 This post received KUDOS C x - money that was spent on illuminating the gym. (x+96)*\frac13*\frac{60}{100}=96 x=5*96-96=4*96=384 I think it is easy-medium level. But maybe I have wrong answer? _________________ iOS/Android: GMAT ToolKit - The bestselling GMAT prep app | GMAT Club (free) | PrepGame | GRE ToolKit | LSAT ToolKit PROMO: Are you an exiting GMAT ToolKit (iOS) user? Get GMAT ToolKit 2 (iOS) for free* (read more) Math: GMAT Math Book ||| General: GMATTimer ||| Chicago Booth: Slide Presentation The People Who Are Crazy Enough to Think They Can Change the World, Are the Ones Who Do. Director Joined: 01 Jan 2008 Posts: 635 Followers: 3 Kudos [?]: 114 [0], given: 1 Re: PS - % [#permalink] 23 Jan 2008, 09:38 I second walker, quick solution! Manager Joined: 20 Sep 2007 Posts: 112 Followers: 1 Kudos [?]: 17 [0], given: 0 Re: PS - % [#permalink] 23 Jan 2008, 09:43 Answer is B Extra bulbs 1/3 T = 160 Total bulbs T=480 (60/100) xcost of extra bulbs = 96 cost of extra bulbs=160 cost of each bulb = 1 cost of required bulbs=320 CEO Joined: 17 Nov 2007 Posts: 3594 Concentration: Entrepreneurship, Other Schools: Chicago (Booth) - Class of 2011 GMAT 1: 750 Q50 V40 Followers: 230 Kudos [?]: 1299 [2] , given: 346 Re: PS - % [#permalink] 23 Jan 2008, 10:09 2 This post received KUDOS I think we have to add losses 0.4*160=64 320+64=384. _________________ iOS/Android: GMAT ToolKit - The bestselling GMAT prep app | GMAT Club (free) | PrepGame | GRE ToolKit | LSAT ToolKit PROMO: Are you an exiting GMAT ToolKit (iOS) user? Get GMAT ToolKit 2 (iOS) for free* (read more) Math: GMAT Math Book ||| General: GMATTimer ||| Chicago Booth: Slide Presentation The People Who Are Crazy Enough to Think They Can Change the World, Are the Ones Who Do. Manager Joined: 01 Jan 2008 Posts: 231 Schools: Booth, Stern, Haas Followers: 1 Kudos [?]: 37 [0], given: 2 Re: PS - % [#permalink] 23 Jan 2008, 10:40 walker wrote: I think we have to add losses 0.4*160=64 320+64=384. yeah, you are right, I didn't understand the question correctly +1 Manager Joined: 16 Apr 2008 Posts: 96 Followers: 1 Kudos [?]: 15 [0], given: 7 Re: PS - % (m02q37) [#permalink] 12 Jul 2010, 06:16 Yeah, i agree.. have to add the loss . 320+64=384 Final answer C Intern Joined: 05 Jul 2010 Posts: 28 Followers: 0 Kudos [?]: 16 [0], given: 7 Re: PS - % (m02q37) [#permalink] 12 Jul 2010, 07:06 Yeah, I agree. It's C, but the question is quite tricky. _________________ If you like my posts please consider giving me KUDOS!!!!!!!!! Thanks:) Intern Joined: 29 Mar 2010 Posts: 17 Schools: UCLA, USC WE 1: 3 Yr at leading SAAS company Followers: 0 Kudos [?]: 0 [0], given: 0 Re: PS - % (m02q37) [#permalink] 12 Jul 2010, 14:52 A number of light bulbs were purchased to illuminate a gym. However, only of them were needed. The extra 160 light bulbs were returned. 60% percent of their cost, or$96, was reimbursed. How much money was spent on illuminating the gym?

(A) 360
(B) 320
(C) 384
(D) 364
(E) 160

Ans: C

Let Total Bulbs be X
1/3X=160 => X=480(Total)

Also,
Let Z=Price of 1 bulb
160*60*z/100=96
=>z=1(1 bulb price)

Thus Price Paid for illuminating gym= 480(Total Cost)-96(Refund)
=384 (C)

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Re: PS - % (m02q37) [#permalink]  15 Jul 2010, 14:28
The question is not very clear. But since some of you got it correct, I shall not complain. I thought it was B, 320.
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Re: PS - % (m02q37) [#permalink]  14 Jul 2011, 10:10
Definitely 384. Probably about a 600-700 level question.
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Re: PS - % (m02q37) [#permalink]  15 Jul 2011, 06:58
Definitely C.Easy question
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Re: PS - % (m02q37) [#permalink]  15 Jul 2011, 07:49
yes i agree with 384, but what is the correct answer for this?
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Re: PS - % (m02q37) [#permalink]  15 Jul 2011, 08:53
I also think the answer is 384.The people who got the answer as 384 should add 64 (the amount lost with 320)
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Re: PS - % (m02q37) [#permalink]  19 Jul 2011, 04:35
Trick question but I agree that question is not very clear.
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Re: PS - % (m02q37) [#permalink]  11 Jan 2012, 07:08
I don't think the problem is tricky but I found the wording confusing. So, I interpreted the problem wrongly. One doubt : Does the reimbursement refer to the money for unused bulbs or the money used for the entire stock?

It has a sentence correction error: "Their" has no clear referent.
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Re: PS - % (m02q37) [#permalink]  18 Jul 2012, 05:58
dzyubam wrote:
A number of light bulbs were purchased to illuminate a gym. However, only \normal\frac{2}{3} of them were needed. The extra 160 light bulbs were returned. 60% percent of their cost, or $96, was reimbursed. How much money was spent on illuminating the gym? (A) 360 (B) 320 (C) 384 (D) 364 (E) 160 [Reveal] Spoiler: OA C Source: GMAT Club Tests - hardest GMAT questions 1/3 bulb -- 160 so 2/3 = 320 Total = 480 Required was 320 and 160 extra 60% 0f cost = 96 100% of cost = 1oo * 96/ 60 = 160 so cost of 160 bulbs = 160 so required 320 was 320 and 96 was returned = 160 - 96 = 64 so total spent = 320+64 = 384 Ans C. Did within 2 mins !! _________________ “The best time to plant a tree was 20 years ago. The second best time is now.” – Chinese Proverb Manager Joined: 14 Jun 2012 Posts: 66 Followers: 0 Kudos [?]: 6 [0], given: 1 Re: PS - % (m02q37) [#permalink] 18 Jul 2012, 20:39 Good one. Tricky question in terms that it is not difficult to solve but just that one needs to be careful in reading the question. I selected B and almost at that instant realized my mistake. Nice. Need to focus more on the question asked. _________________ My attempt to capture my B-School Journey in a Blog : tranquilnomadgmat.blogspot.com There are no shortcuts to any place worth going. Intern Joined: 18 Jan 2012 Posts: 46 Location: United States Followers: 1 Kudos [?]: 36 [0], given: 21 Re: PS - % (m02q37) [#permalink] 19 Jul 2012, 00:36 Quote: A number of light bulbs were purchased to illuminate a gym. However, only 2/3 of them were needed. The extra 160 light bulbs were returned. 60% percent of their cost, or$96, was reimbursed. How much money was spent on illuminating the gym?

Total nr of bulbs bought initially - say n
Of these bulbs, 2/3 of them were used and hence 1/3 (1-2/3) bulbs were returned to the retailer.
This implies that 1/3 (of) n bulbs were returned.

1/3 of n = 160 bulbs ==> n = 480 (Remember n refers to the original nr and 160 refers to the number of bulbs
that were returned)
Lets determine the nr of bulbs that were used for lighting the gym.

2/3 of (480) = 320 bulbs were used to illuminate the gym.

Ok, now comes the tricky part. As per the question stem - 60% of the their cost was refunded.The trick is to understand
identify the antecedent of the pronoun "their"

This interpretation makes sense.
Think of if this way, some retailers sell products under the condition that on return, they will NOT refund 100 % of the amount paid by the customer.Instead they will refunded a reduced % - say 70 % of the initial price. This policy is to discourage people from buying large quantities and then return these products for a refund.
Back to the question :-
When 160 bulbs were returned, the retailer refunded only 60% of the COST of THESE 160 bulbs
i.e .6x of (total cost of 160 bulbs that were returned) = $96 total cost of 160 bulbs that were returned =$160
Cost of 1 bulb = $1 Total Cost of lights used to decorate the gym= Cost of the 320 Bulbs that were not returned = 320 x$1
= \$320
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Re: PS - % (m02q37) [#permalink]  19 Jul 2012, 05:05
TheMBAist wrote:
The question is not very clear. But since some of you got it correct, I shall not complain. I thought it was B, 320.

B could have been the answer if the question were "How much does it cost to illuminate the gym?"
C is the answer to the actual question "How much money was spent on illuminating the gym?"

Cheers
Re: PS - % (m02q37)   [#permalink] 19 Jul 2012, 05:05
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