Friends A and B meet for dinner or spa days very regularly. Bill is always split 50/50 as they tend to have similar tastes in food, wine etc.
They met last night at a restaurant that both wanted to go to. On arrival, A mentions that she was a £100 voucher for that restaurant that she’s happy for them to use it towards the meal as it’s not a place she goes to often.
Both eat and drink and have a lovely night.
The bill arrives and it’s for £144.
Who should pay what?