Sophism

There’re three friends to lodge in a certain hotel together.
This hotel room charge is $300. Everyone paid his own share of $100 each.

Actually this room charge is $250 therefore hotel manager bring the return money of $50 to them by way of a servant. But a servant steals $20 from part of this money. Accordingly, a servant returns money to them only $30. Three friends divide $10 each.
Three friends paid to hotel each $90 per man. ‘Cause $10 is return back per man. To sum up, their total payment is $270. ($90 × three). And a servant’s steal money is $20.

After all, total payment of $270 plus steal money of $20 equals $290. This is difference first payment of $300.
Where is a difference of $10?

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