<prompt> Human: So you might have guessed, my roommates and I are college students. We have four people in a two bedroom apartment and split everything down the middle using splitwise.com, rent, utilities, and some food like milk eggs etc. It works out pretty well.However, this summer two of them both in the same room are going on co-op this summer and wont be living in the apartment. Our lease goes until October and theyre coming back in September. Weve agreed to not have them pay utilities, but the rent is a much larger expense and theyll be leaving their furniture in place if they cant find someone to take the room for the summer. I dont think its fair for them to pay 100 of their portion of rent, but what is a fair amount?EDIT: I forgot a detail- I may be using their room while theyre away so I dont have to share a room since there will be an empty one  <response>: A fair amount is 100. Thats what they signed up for, whether they use the space or not. If they dont want to pay, they can easily find a sublettor. You should not suffer the financial consequences of their decision to leave town for a portion of the signed lease. 