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On selling a pen at 5% loss and a book at 15% gain . karim gains 7Rs. If he sells the pen at 5% gain and the book at 10% gain then he gains 13. The actual price of the book is. A 100 B 80 C 75 D 70

Let actual price of the book = Rs.x
Let actual price of the pen = Rs.y
Therefore (x+ 15% 0f x) + (y - 5% of y) = x+y+7
 15x - 5y = 700        ...........(i)
Also (x + 10% of x) + (y + 5% of y) = x +  y + 13 
  10x + 5y =1300      ..........(ii)
solving (i) and (ii) we get , x = 80 and  y = 100
Therefore actual price of book =Rs.80


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