self Maths Puzzle

A lady buys goods worth $200 from a shop. (shopkeeper selling the goods with zero profit).
The lady gives the shopkeeper a $1000 note.
The shopkeeper gets some change from the shop next door and keeps $200 for himself and returns $800 to the lady.
Later the shopkeeper of the next shop comes with the $1000 note saying "fake" and takes his money back.
How much LOSS did the shopkeeper face?

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self Other Question


A set has exactly five consecutive positive integers starting with 1. What is the percentage decrease in the average of the numbers when the greatest one of the numbers is removed from the set?
find the remainder when 3164 is divided by 162?