A lady buys goods worth Rs.200 from a shop

Shopkeeper and duplicate Note Puzzle
Crack it if u can . . Comment Fast !!!!

(This was asked in IAS exam!)
A very simple but confusing puzzle.
A lady buys goods worth rs.200 from a shop. (shopkeeper selling the goods with zero profit).
The lady gives him 1000 rs note. The shopkeeper gets the change from the next shop and keeps 200 for himself and returns rs.800 to d lady.
Later the shopkeeper of the next shop comes with the 1000rs note saying "duplicate" and takes his money back.
"How much LOSS did the shopkeeper face ?"
A. 200
B. 800
C. 1200
D. 1800
E. 2000
F. 1600
G. Other
Simple yet confusing n challenging...

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Answers is Rs. 1000
The Shopkeeper Gave Rs.800 to the lady and also goods worth Rs.200 (only this is actual Loss)
Also the shopkeeper had to give Rs.1000 to the Shopkeeper of the next shop but it was the amount he had taken from him in lieu of the Fake Note. (This Nullifies itself - So no profit / loss here )
Hence in total The Shopkeepeer's loss is Rs. 1000