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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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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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