<prompt> Human: Me and two other people share a 3br apartment right now at 1650mo. Two of us, including myself pay 500mo for small bedrooms, and the third roommate, lets call her Shelby, pays 650mo for the master. Shelbys boyfriend had his lease run out, and weve got 3 months left on ours. She is asking if he can move in for the remainder of our lease, and is willing to pay rent and bills. How much should I ask from him? What is fair?  <response>: She pays more for the bigger bedroom, however he should pay more, I would say drop the other two peoples rent by 100-150 each and make him pay 200-300 bucks. Make sure you run this arrangement by the landlord and have him sign the lease as well. 