wow, expensive dinner. that's about $160 in US currency. OP, be thankful that he's going on a date with you and paying for the meal. there's plenty more FMLs here that talk about cheapskate BFs who make their dates pay for their own meal.

I calculate tip after tax so it would've been a tip on 120? or something like that. maybe that's what he was doing

does he happen to be a math professor at harvard??

OP is from the UK, where it is actually a very good tip indeed, as people actually get a decent minimum wage and don't rely on customers generosity.

If he's dumb enough to take you out, it's not surprising that he can't solve such a wicked hyper-analytical differential calculus problem. For my fellow stupid Americans, £100 is about 50% more money than $100.

Plus the bill was £100, this must have been some serious meal ! 15% on that is a lot

next time pay yourself bitch

Don't know why you have to attack him op... He was nervous and just because someone is bad at math that doesn't mean he's stupid.

women always have to complain about something. He paid for dinner cut him some slack

instead of taking the piss out of your new boyfriend maybe you should be glad that he spent 100 quid on you on a first date and wanted to give a generous tip by UK standards. ungrateful.