To get easy money, save the game and then use a text editor to edit the .FDS file in the "/prison tycoon 2/data/maps" directory. Find the lines:
STATISTICS
0,100000,0,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
/STATISTICS
Here you have to edit the second number to reflect the amount of money you want. STATISTICS
0,900000000,0,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
/STATISTICS