On meals/drinks with friends. Example is today.. went for a lunch out with a friend. He suggested just going 50/50 as he couldn’t be bothered working things out… I took a pic of the bill and realised on way home I overpaid by £20 . Just so annoying. How should I do it.. short of adding things up as you go along. It was 2 courses with 1 bottle of wine plus 2 drinks for me and about 5 for him. I did not realise he had so much more! Maybe I just need to say let’s pay for what we each had going forward but it feels so awkward to do that