50/50 1. that guy is already ready for 50/50 deal and should not change later. he can create problem and can change roomate everyday (as he might have 2 suitcase). family people can't do this. 2. i had the same situation when i was student. he was ready to pay 50/50. i. my wife help to cook and clean house and cooking pot. ii. we did shopping (he never did) iii. he was more like paying guest. iv. he never paid rent on time. v. one day it went 3 months rent due. vi. i asked for rent and he says he is ready for only 1/3. vii. to settle down problem, i called university police and that single guy was made to pay all rent and was warned of not to do same again. viii. we seperate following month.