Cockfight Problem - Where's my money?
There are 3 cockfight arena you bet into.
You paid $2 for every entrance fee and $2 for the exit.
In the 1st arena you bet your remaining money for a 1 cockfight and you won and then you transferred to the next arena. The same happened at the 2nd and 3rd arena. If you exit at the 3rd arena without money left, how much money did you brought before entering at the 1st arena?
Note: The money doubled every time he won. There is an entrance and exit in every arena.