GIRL CHEATING

A girl has purchased a book worth Rs. 30 and she gave him a 100 rupee note. Since he does not have change, he got the change from another shopkeeper and gave her the change. After sometime, the shopkeeper comes with a 100 rupee note and told that it is a fraud and so he takes his money back. How much does the bookkeeper lose?

 Answer:
100 rupees

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