Loss Loss

I purchased a book for RS. 70.  My friend said , "I like this book. Give it to me,
I’ll pay for it." You can buy a new one. I obliged and he gave me a 100 rupee note. 

As I didn’t have change, I got it from a nearby shop and
gave him the balance of Rs.30. He departed.

After my friends departure, the shopkeeper came to  me and said the hundred
rupee note given by my friend is a fake one . So I gave him another note from my purse.

The question is: How much did I lose?
Rs 70/-? Rs 100/-?, Rs 130/-? Rs 200/-? or  some other  amount?

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