Please answer fast!!! 1000copiesof a book are sold at a loss of Rs520. If one book costs Rs 10.50, find the selling price of 1000 books.

First we will find the C.P. of 1000 books i.e. cost of one book *1000
We know that 1000 books are sold at a loss of Rs 520. So S.P.=10500-520

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