General Mental Ability Questions

Question

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 Rs.1000 note. The shopkeeper gets the change from the next shop and keeps Rs.200 for himself and returns Rs.800 to the lady.
Later the shopkeeper of the next shop comes with the Rs.1000 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. 1000

Simple yet confusing and challenging.

Answer 

The answer is Rs.1000.
 

Inorder to solve the problem we need to examine each individual transactions done by the shopkeeper.
 

We can divide the Transactions into two.

Transaction 1:-

Between the shopkeeper and the lady.In this transaction the shopkeeper gives Rs.200 worth goods and RS.800 to the lady by accepting the totally useless Rs.1000 counterfeit currency.

Transaction 2:-

Between the shopkeeper and the neighbour.In this transaction the shopkeeper gives 1000Rs counterfeit currency to the neighbour by accepting 1000 Rs usefull notes.Later the shopkeeper will return 1000Rs usefull notes to the neighbour.
 

So there is no net gain or loss to the shopkeeper in this transaction.So there is no need to consider this transaction.

So net loss to the shopkeeper =Rs.200 worth goods + Rs.800