Unfriendly Persuasion

 is a quest in Fallout: New Vegas.

Quick walkthrough
Marcus asks you to convince some NCR mercenaries to go away peacefully. With 65speech you can simply ask them to leave and complete the quest. If you ask them how much it costs to bribe them they will say 2500caps. You can get the caps from marcus by asking him. If you then use speech to convince them to leave for free you have just earned a mint.