<prompt> Human: I booked a hotel for MDW, staying for three days costing me 290, so 96.66 a night. Me and my buddy are splitting that halvies. If we want some friends to come for the weekend, lets say one comes for a night, and the other comes for two nights. Whats the fairest way to bill them?  <response>: If youre inviting them to come up, I wouldnt suggest they pay anything. If theyre asking to come up, just split those days between everyone sharing the room. Paypal, Venmo, Google Wallet, etc. There are plenty of ways for them to send you small amounts to cover their share, but if its a hey well be up there come hang out with us you really shouldnt be expecting them to pay anything. 