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Question 13 : On selling a pen at 5% loss and a book at 15% gain, Karim gains Rs. 7. If he sells the pen at 5% gain and the book at 10% gain, he gains Rs. 13. What is the cost price of the book in Rupees?
From the question, let us frame the following equations
-P x 5% + b x 15% = 7 ---(1)
P x 5% + b x 10% = 13 --- (2)
b x (25%) = 20
Price of Book = b = Rs. 80
The question is "On selling a pen at 5% loss and a book at 15% gain, Karim gains Rs. 7. If he sells the pen at 5% gain and the book at 10% gain, he gains Rs. 13. What is the cost price of the book in Rupees? "
Choice A is the correct answer.
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