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In a College Bookstore where all books are...
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In a College Bookstore where all books are the same price, a + b books are selling for Rs.1,000. Myron buys 12 books and for each one has a discount of Rs.1. How much does Myron need to pay ?

 
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a+b books can be bought for 1000
so 1 book can be bought for 1000/(a+b)
since 1 rs/- discount....
so [(1000/(a+b))-1]*12

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