ques

Asked by nishac | 11th Jan, 2010, 04:04: PM

Expert Answer:

 

Let the shopkeeper buys x number of books.

Cost of 1 book = 8000/x       ................(1)

In the second case, cost of 1 book =  Rs. 8000/ (x + 40)  ........(2)

According to the condition,

(8000/x)  - (8000/ (x + 40)) = 10

On simplifying you will get a quadratic equation, x2 + 40x - 32000 = 0

On solving the quadratic equation you will get the number of books as 160 and 200.

So, initially he bought 160 books.

 

Answered by  | 11th Jan, 2010, 04:18: PM

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