A man visits a gift shop and buys an article for Rs.80/-. He pays the shopkeeper a Rs.100/- note. The shopkeeper doesn't have any change. Thus he approaches his neighbouring shopkeeper and asks him for change. The neighbouring shopkeeper takes the Rs.100/- note and gives ten Rs.10/- notes to the shopkeeper. The shopkeeper then keeps eight(Rs.80/-) of the notes with him and returns the two(Rs.20/-) to the man. The man walks away with the article and Rs.20/-
After some time, the neighbouring shopkeeper finds that the Rs.100/- note is fake and asks for replacement with the shopkeeper. The shopkeeper with no other alternative gives his neighbour another 100 rupees. Now, what is the loss suffered by the shopkeeper?