Just returned from a girls weekend away - 3 friends visited one friend who lives overseas.
The overseas friend said she’d pay for everything whilst we were there to save our cards getting charged for lots of little overseas transactions and we could just transfer her the money at the end.
One friend made a note of everything she ordered, drank, did etc and how much her share was and instead of waiting for the total to come through has said oh I owe XX amount. She’s missed a few things (so small that you might forget) but also had taken off some things - tips / service as she thinks it’s OTT (though customary) in the country we visited, and taxis (one friend is recovering from a knee op so we occasionally got a cab if she was feeling sore) as she said she was happy to walk / get public transport. And a few times she got cheaper wine etc.
I don’t actually drink at all and can walk fine so technically mine should be even less than hers but either me and the other friend pay more to make her part up, or the host friend is out of pocket. Host friend already paid for dinner on our last night as a thank you for travelling to her and we stayed at hers (in an expensive city) for free for 4 nights.
YANBU - friend is BU
YABU - host friend and injured friends are for passing on the costs of tips and taxis