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iwantto
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A man buys 20 pens and 12 books for Rs. 320. He sells pens Updated on: 02 Apr 2013, 13:07
Originally posted by iwantto on 02 Apr 2013, 13:05.
Last edited by Bunuel on 02 Apr 2013, 13:07, edited 1 time in total.
Renamed the topic and edited the question.
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50% (01:46) correct 50% (03:36) wrong based on 2 sessions

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A man buys 20 pens and 12 books for Rs. 320. He sells pens at a profit of 40 % and books at a gain of 25 %. If his overall profit was Rs. 70, the cost price of the book is

A. 10
B. 12
C. 13
D. 15
E. None

Please help!!!

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A
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johnwesley
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A man buys 20 pens and 12 books for Rs. 320. He sells pens 02 Apr 2013, 15:52
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Are you sure this problem is well formulated?
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iwantto
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A man buys 20 pens and 12 books for Rs. 320. He sells pens 02 Apr 2013, 16:28
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I found this one on some site,

This is what I was trying -
20x + 12y = 320
1.4*20x+1.25*12y=390

but couldn't get answer.
Do you think something's missing??

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A man buys 20 pens and 12 books for Rs. 320. He sells pens 02 Apr 2013, 21:50
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iwantto
A man buys 20 pens and 12 books for Rs. 320. He sells pens at a profit of 40 % and books at a gain of 25 %. If his overall profit was Rs. 70, the cost price of the book is

A. 10
B. 12
C. 13
D. 15
E. None

Please help!!!

Overall profit = (70/320)*100 = 21.875%
This is less than the profit he made on pens as well as books which is not possible. There is something wrong with the numbers here.
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A man buys 20 pens and 12 books for Rs. 320. He sells pens 04 Apr 2013, 07:38
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iwantto
A man buys 20 pens and 12 books for Rs. 320. He sells pens at a profit of 40 % and books at a gain of 25 %. If his overall profit was Rs. 70, the cost price of the book is

A. 10
B. 12
C. 13
D. 15
E. None

Please help!!!

OA should be E
bcoz

Ps + Bs = 320 .....eq(1)
0.4Ps + 0.25Bs = 70 ....eq(2)

solving we get, Bs = cost price of 12 books = 5800/15
so, cost price of a book = 5800/(15*12) = 1160/9
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A man buys 20 pens and 12 books for Rs. 320. He sells pens 08 Dec 2019, 00:10
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Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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