<prompt> Human: So next year me, my girlfriend, and 3 other people are going to try and share a 4 bedroom duplex for next school year. Me and my girlfriend are planning to share a room, and then the other 3 will have their own room. Were kind of arguing to try and figure out the most equal way to do the payments because me and my girlfriend feel like we shouldnt split the rent of 1800 between the five of us equally because we share a room. Can you guys give me any payment ideas? Thankyou.Disregard the utility payments for the sake of this please  <response>: Cost allocation is a blast! Split utilities 5 ways. For rent, it probably makes sense to think in terms of rent for shared space and rent for personal space. Ive seen it done on square footage, but you might simplify it and say something like 25-40 get everyone to agree on this. The shared space gets split 5 ways. Divide the rest of the rent up 4 ways this might not be an even split depending on room sizes, private bathrooms, etc. 