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# Henry purchased 3 items during a sale. He received a 20

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Intern
Joined: 17 Jan 2012
Posts: 41
GMAT 1: 610 Q43 V31
Henry purchased 3 items during a sale. He received a 20  [#permalink]

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Updated on: 08 Mar 2015, 12:29
8
29
00:00

Difficulty:

55% (hard)

Question Stats:

66% (02:21) correct 34% (02:25) wrong based on 1080 sessions

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Henry purchased 3 items during a sale. He received a 20 percent discount off the regular price of the most expensive item and a 10 percent discount off the regular price of each of the other 2 items. Was the total amount of the 3 discounts greater than 15 percent of the sum of the regular prices of the 3 items?

(1) The regular price of the most expensive item was $50, and the regular price of the next most expensive item was$20

(2) The regular price of the least expensive item was $15 Attachment: Henry discount on items.GIF [ 14.71 KiB | Viewed 18228 times ] Originally posted by docabuzar on 27 Jan 2012, 05:24. Last edited by Bunuel on 08 Mar 2015, 12:29, edited 3 times in total. Added the OA ##### Most Helpful Expert Reply Math Expert Joined: 02 Sep 2009 Posts: 50613 Re: Henry purchased 3 items during a sale. He received a 20 [#permalink] ### Show Tags 27 Jan 2012, 05:32 22 22 docabuzar wrote: Henry purchased 3 items during a sale. He received a 20 percent discount off the regular price of the most expensive item and a 10 percent discount off the regular price of each of the other 2 items. Was the total discount of these three items greater than 15 percent of the sum of the regular prices of the 3 items? (1) The regular price of the most expensive item was$50, and the regular price of the next most expensive item was $20 (2) The regular price of the least expensive item was$15

Let the prices be a, b, and c, so that a > b > c.

Basically the questions: is $$0.2a+0.1b+0.1c>0.15(a+b+c)$$? --> is $$a>b+c$$?

(1) The regular price of the most expensive item was $50 and the regular price of the next most expensive item was$20 --> $$a=50$$, $$b=20$$, $$c\leq{20}$$ (as the second most expensive item was $20 then the least expansive item, the third one, must be less than or equal to 20). So the question becomes: is $$50>20+c$$ --> is $$c<30$$? As we got that $$c\leq{20}$$, hence the above is always true. Sufficient. (2) The regular price of the least expensive item was$15. Clearly insufficient.

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Re: Henry purchased 3 items during a sale. He received a 20  [#permalink]

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27 Jan 2012, 06:21
Then it makes sense. Thanks
Intern
Joined: 17 Jan 2012
Posts: 41
GMAT 1: 610 Q43 V31
Re: Henry purchased 3 items during a sale. He received a 20  [#permalink]

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27 Jan 2012, 06:25
THe Q asks for the which of discounts will be greater 20%, 10%, 10% on A, B, C resp or 15% on (A+B+C). How can we say its same as 50> 20+C ? Now I m totally lost.
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Re: Henry purchased 3 items during a sale. He received a 20  [#permalink]

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27 Jan 2012, 06:30
1
docabuzar wrote:
THe Q asks for the which of discounts will be greater 20%, 10%, 10% on A, B, C resp or 15% on (A+B+C). How can we say its same as 50> 20+C ? Now I m totally lost.

The questions asks: is $$0.2a+0.1b+0.1c>0.15(a+b+c)$$? After simplifying we'll get that the question becomes: is $$a>b+c$$?

(1) says $$a=50$$ and $$b=20$$. Also we concluded that: $$c\leq{20}$$. Now, if we substitute the values of a and b we'll get that the question boils down to: is $$50>20+c$$? or is $$c<30$$?

Hope it's clear.
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Joined: 17 Jan 2012
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GMAT 1: 610 Q43 V31
Re: Henry purchased 3 items during a sale. He received a 20  [#permalink]

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27 Jan 2012, 06:34
Thanks. Its clear now.

Just how do you know to keep A on one side & B & C on other? This simplied the Ans a lot.
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Re: Henry purchased 3 items during a sale. He received a 20  [#permalink]

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27 Jan 2012, 06:38
docabuzar wrote:
Thanks. Its clear now.

Just how do you know to keep A on one side & B & C on other? This simplied the Ans a lot.

It really doesn't matter how you write it: $$a>b+c$$, $$a-b-c>0$$, $$a-b>c$$, ... You still will get the same result. For me $$a>b+c$$ was the most "attractive" form, so I chose this one.
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Re: Henry purchased 3 items during a sale. He received a 20  [#permalink]

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22 Aug 2014, 19:30
Bunuel: if the first item is 50, the next 2 are 20. If I take 20% of 50 I get 10 and 10% of 20 I get 2. Total discount is 14 and total price is 90. 14/90>.15. What's am I doing wrong?
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Re: Henry purchased 3 items during a sale. He received a 20  [#permalink]

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23 Aug 2014, 11:21
2
bankerboy30 wrote:
Henry purchased 3 items during a sale. He received a 20 percent discount off the regular price of the most expensive item and a 10 percent discount off the regular price of each of the other 2 items. Was the total discount of these three items greater than 15 percent of the sum of the regular prices of the 3 items?

(1) The regular price of the most expensive item was $50, and the regular price of the next most expensive item was$20
(2) The regular price of the least expensive item was $15 Bunuel: if the first item is 50, the next 2 are 20. If I take 20% of 50 I get 10 and 10% of 20 I get 2. Total discount is 14 and total price is 90. 14/90>.15. What's am I doing wrong? Total discount =$14.
The sum of the regular prices of the 3 items = $90. 15% of$90 = $13.5.$14 > $13.5. _________________ Intern Joined: 16 Jun 2015 Posts: 10 Schools: HBS '20, Wharton '20 Re: Henry purchased 3 items during a sale. He received a 20 [#permalink] ### Show Tags 15 Jul 2017, 10:24 1 I believe this question is a perfect example of an "Easy C" trap. Just by realizing that A&B would be sufficient and make the problem way too easy, we can eliminate C,D and E. This is a simple rule that could improve one's chances on 700+ problems Current Student Joined: 13 Mar 2012 Posts: 13 Location: India Concentration: Technology, Entrepreneurship GMAT 1: 750 Q49 V42 GPA: 3.5 Re: Henry purchased 3 items during a sale. He received a 20 [#permalink] ### Show Tags 18 Dec 2017, 23:35 Fortunately or Unfortunately, the OA is C for this one. I'm staring at the answer on GMATPREP software :/ Attaching screenshot Attachments Henry Purchased 3 items.docx [823.94 KiB] Downloaded 58 times  To download please login or register as a user Math Expert Joined: 02 Sep 2009 Posts: 50613 Re: Henry purchased 3 items during a sale. He received a 20 [#permalink] ### Show Tags 18 Dec 2017, 23:47 2 vishal205 wrote: Fortunately or Unfortunately, the OA is C for this one. I'm staring at the answer on GMATPREP software :/ Attaching screenshot The OA for the question discussed above is A, NOT C. The question you attached is not the one discussed above, it's another one discussed here: https://gmatclub.com/forum/henry-purcha ... 94280.html _________________ Manager Joined: 20 Jun 2018 Posts: 66 Location: India Re: Henry purchased 3 items during a sale. He received a 20 [#permalink] ### Show Tags 14 Jul 2018, 20:03 Bunuel wrote: docabuzar wrote: Henry purchased 3 items during a sale. He received a 20 percent discount off the regular price of the most expensive item and a 10 percent discount off the regular price of each of the other 2 items. Was the total discount of these three items greater than 15 percent of the sum of the regular prices of the 3 items? (1) The regular price of the most expensive item was$50, and the regular price of the next most expensive item was $20 (2) The regular price of the least expensive item was$15

Let the prices be a, b, and c, so that a > b > c.

Basically the questions: is $$0.2a+0.1b+0.1c>0.15(a+b+c)$$? --> is $$a>b+c$$?

(1) The regular price of the most expensive item was $50 and the regular price of the next most expensive item was$20 --> $$a=50$$, $$b=20$$, $$c\leq{20}$$ (as the second most expensive item was $20 then the least expansive item, the third one, must be less than or equal to 20). So the question becomes: is $$50>20+c$$ --> is $$c<30$$? As we got that $$c\leq{20}$$, hence the above is always true. Sufficient. (2) The regular price of the least expensive item was$15. Clearly insufficient.

Where is it mentioned that b>c? both the items could've the same price or even c>b? No? Please correct me.
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Re: Henry purchased 3 items during a sale. He received a 20 &nbs [#permalink] 14 Jul 2018, 20:03
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