I just keep redoing the oval race and get $14.500 in 3 mins, and in not time at all your bank account will hit the 1 million and by doing it this way it will take some time but not a very long time as you progress through the levels the money get's higher and you may find a race that pays alot more then what you do is just keep doing that race and so on until you achive the aquired level that you want.
