Simply gather as many people as you can to play one of these missions: http://socialclub.rockstargames.com/games/gtav/jobs/job/zY_8MOGJuUuYOsGB1MYc6w?platformId=1 http://socialclub.rockstargames.com/games/gtav/jobs/job/_6fk9aKOxEqXepps8RfyIw?platformId=1 If playing deathmatch, simply grab a parachute and hop down. Then, hop in the Frogger on the side of the building, and fly to the top of the skyscraper. Just grab the guns and begin the boosting! If racing, you should get as many players as possible, and simply race to the end. It takes anywhere from 25 - 50 seconds to beat, and with max players nets an average of $8K and 1560 RP. This is extremely easy to do, so long as you have players to help you with it.