No Second Chance

Let me ask simple que..
A lady buys goods of Rs.200 from a shop & pays a 1000 rupee note to the shopkeeper. The shopkeeper gets the change fromthe next shop & keeps Rs.200 for himself & returns Rs.800 to the lady.
The lady then leaves the shop with her purchased goods. After sometime the next shop owner returns the 1000 rupee note saying it is 'duplicate' & takes his money back.
Now, how much total loss did thisshopkeeper had to suffer?