Confusing Question asked in IAS exam

(This was asked in IAS exam!)
A very simple but cnfusing 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 shopkeepr gets the change from
the next
shop and keeps 200 for himself and
returns
Rs.800 to the lady.
..
Later the shopkeepr of the next shop
comes
with
the 1000 rs note saying "duplicate"
and takes
his
money back.
.
.
How much LOSS did the shopkeepr
face.?
..
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