For Playstation users, look for a race called AFK RP. It is an easy race that goes around a track and you really don't have to do anything. Make sure that you set it to 7 laps and make sure it goes over 4 minutes for more money and RP. When you get to level 25, go to mission Potshot. Set it to hard and make sure you have a large vehicle. When it starts, go the point it tells you to go to, but just block the bridge with your big car (small cars will let it escape and will start long chase- IT'S ANNOYING) and shoot the driver. When you get in the car and leave, nobody will chase after you and you receive 7000 dollars and a lot of RP. It is fast and easy to do.