One day, a man walked into a souvenir shop.
There was this souvenir he was interested to buy.
The price was tagged at $21, but the cost price of the souvenir was $18.
The man paid the shop owner with a $100 note.
Not having enough small change, the shop owner went across road to
exchange the $100 note with his friend and return $79 to the man.
The
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