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# Employees of a department store receive a 20% discount on

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GMAT Instructor
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Employees of a department store receive a 20% discount on [#permalink]  25 Aug 2006, 06:43
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Employees of a department store receive a 20% discount on the discounted price of all store merchandise. As the holiday season is coming to an end, some of the socks in the menswear department have been marked down by 40%, and the rest have been marked down by only 10%. Sean, a department store employee bought 16 pairs of socks whose original price was $10.00 each. Were most of the pairs marked down by 40%? (1) He paid for the socks with a$100 bill.
(2) If Sean were not a department store employee, he would have paid less than $120. Last edited by kevincan on 25 Aug 2006, 07:38, edited 1 time in total. Director Joined: 13 Nov 2003 Posts: 790 Location: BULGARIA Followers: 1 Kudos [?]: 30 [0], given: 0 [#permalink] 25 Aug 2006, 07:14 IMO if he bought 8 pairs with 40% discount and 8 pairs with 10% discount , this would cost Shean 120$ for the 16 pairs.
A is sufficient to ans the question and so is B
D should be the ans
Senior Manager
Joined: 14 Jul 2005
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D it is ...

From 1, total without discount >= $125 Hence we get x + y = 16 and 9x+6y >= 125 SUFF From 2, total < 120, hence x = y =16 and 9x+6y <= 120 SUFF Hence answer is D Manager Joined: 09 Jul 2006 Posts: 85 Location: India Followers: 1 Kudos [?]: 0 [0], given: 0 [#permalink] 25 Aug 2006, 10:47 gmatornot wrote: D it is ... From 1, total without discount >=$125

Hence we get x + y = 16 and 9x+6y >= 125
SUFF

From 2, total < 120, hence x = y =16 and 9x+6y <= 120
SUFF

can u pls explain in more detail pls ?
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Prashrash.

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I am getting strange results with this problem. pls tell me where I am going wrong.

let m pairs be discounted 40%, and n pairs be discounted 10%
For each pair,
Original price = 10
Discounted price = 6 and 9 resp
Dicounted price for emps = 0.8 * discounted price
= 4.8 and 7.2 resp.

from st (1):
100 = 4.8m + 7.2n and m + n = 16
Solving for n, I get n = 29/3 = 10 (since m and n have to be integers)
hence, m = 6

from st (2):
6m + 9n < 120 and m + n = 16
Again solving for n, I get n < 8. Hence m >= 8.

I am wondering, are these 2 statements talking abt the same thing ? (since I am getting 2 completely diff ans for m from 1 and 2
_________________

Cheers!
Prashrash.

GMAT Instructor
Joined: 04 Jul 2006
Posts: 1266
Followers: 24

Kudos [?]: 167 [0], given: 0

prashrash wrote:
I am getting strange results with this problem. pls tell me where I am going wrong.

let m pairs be discounted 40%, and n pairs be discounted 10%
For each pair,
Original price = 10
Discounted price = 6 and 9 resp
Dicounted price for emps = 0.8 * discounted price
= 4.8 and 7.2 resp.

from st (1):
100 = 4.8m + 7.2n and m + n = 16
Solving for n, I get n = 29/3 = 10 (since m and n have to be integers)
hence, m = 6

from st (2):
6m + 9n < 120 and m + n = 16
Again solving for n, I get n < 8. Hence m >= 8.

I am wondering, are these 2 statements talking abt the same thing ? (since I am getting 2 completely diff ans for m from 1 and 2

In (1), where do you get that the socks cost $100? Manager Joined: 09 Jul 2006 Posts: 85 Location: India Followers: 1 Kudos [?]: 0 [0], given: 0 [#permalink] 25 Aug 2006, 11:52 kevincan wrote: In (1), where do you get that the socks cost$100?

(1) He paid for the socks with a $100 bill. oops realized my mistake .. from st (1), we should get 100 >= 4.8m + 7.2n ( we don't know if change was given or not) solving we get, n <= 10 so, m >= 6 so after applying the correction, (1) and (2) is still INSUFF .. hence (E) ?? _________________ Cheers! Prashrash. GMAT Instructor Joined: 04 Jul 2006 Posts: 1266 Location: Madrid Followers: 24 Kudos [?]: 167 [0], given: 0 [#permalink] 25 Aug 2006, 11:58 prashrash wrote: I am getting strange results with this problem. pls tell me where I am going wrong. let m pairs be discounted 40%, and n pairs be discounted 10% For each pair, Original price = 10 Discounted price = 6 and 9 resp Dicounted price for emps = 0.8 * discounted price = 4.8 and 7.2 resp. from st (1): 100 = 4.8m + 7.2n and m + n = 16 Solving for n, I get n = 29/3 = 10 (since m and n have to be integers) hence, m = 6 from st (2): 6m + 9n < 120 and m + n = 16 Again solving for n, I get n < 8. Hence m >= 8. I am wondering, are these 2 statements talking abt the same thing ? (since I am getting 2 completely diff ans for m from 1 and 2 I don't understand the greater than or equal to sign here. Current Student Joined: 28 Dec 2004 Posts: 3387 Location: New York City Schools: Wharton'11 HBS'12 Followers: 14 Kudos [?]: 186 [0], given: 2 [#permalink] 25 Aug 2006, 12:26 this is D..just use simple logic if the total bill wihtout discout is$160...and if all the socks were 10% off it would $146... then 20% employee discount would be roughly$120 dollar...

so...we can see definetly if he paid $100...then most of the socks bought were 40% (i.e greater than 8) 1) is sufficient 2) is sufficient Manager Joined: 09 Jul 2006 Posts: 85 Location: India Followers: 1 Kudos [?]: 0 [0], given: 0 [#permalink] 25 Aug 2006, 12:36 kevincan wrote: prashrash wrote: I am getting strange results with this problem. pls tell me where I am going wrong. let m pairs be discounted 40%, and n pairs be discounted 10% For each pair, Original price = 10 Discounted price = 6 and 9 resp Dicounted price for emps = 0.8 * discounted price = 4.8 and 7.2 resp. from st (1): 100 = 4.8m + 7.2n and m + n = 16 Solving for n, I get n = 29/3 = 10 (since m and n have to be integers) hence, m = 6 from st (2): 6m + 9n < 120 and m + n = 16 Again solving for n, I get n < 8. Hence m >= 8. I am wondering, are these 2 statements talking abt the same thing ? (since I am getting 2 completely diff ans for m from 1 and 2 I don't understand the greater than or equal to sign here. oh no! another mistake. solved for n and got n < 8. since m + n = 16, I took m >= 8. but if m = 8, then n = 8 and 6m + 9n will be = 120. thus m cannot be = 8. so m > 8 and n < 8. thus (B) is the answer. thanx for the correction kevincan. i am losing out due to such oversights all the time _________________ Cheers! Prashrash. GMAT Instructor Joined: 04 Jul 2006 Posts: 1266 Location: Madrid Followers: 24 Kudos [?]: 167 [0], given: 0 [#permalink] 25 Aug 2006, 12:39 Thank YOU for trying the question! OA=B Manager Joined: 16 Aug 2006 Posts: 68 Followers: 1 Kudos [?]: 1 [0], given: 0 [#permalink] 25 Aug 2006, 15:06 It will be B Statement 1 - with 8 sock sat 40% discount and 8 socks with 10% discount, it would cost Sean$96.00. So when he pays with \$100 it is not sure if he bought more 10% discount socks or 40% discount socks. So

Statement 2 - will tell that if he paid less than 120 dollars then he bought 40% socks more...
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