<prompt> Human: Just to get right to the point Im an E-5 in the military that gets paid BAH basic allowance for housing 1600 on top of an additional 2600 base pay. The prospective roommate is an e-4 gets paid somewhere around the 2400 mark, and just came back from a deployment. My rent is 1000 even with my power bill being at about 100. The next few months Ill be going in and out to sea so I dont count groceries in the mix. And while Im gone theres a chance they would be the one watching my dog. Im just looking for suggestions here maybe with or without dog care in there. Ive lived with them before and I was so dumb and didnt have them pay much except groceries. So before I ask them to move with me again I want to have a number to offer them. Thanks guys! Also please delete if this isnt where I should be posting this.  <response>: fair answer is 500. theres no norm in this country to index rent to income.If you want to give them a gift, thats up to you. No one can tell you how to spend your money. 