Right I had to borrow £20 of my younger 18 year old brother, because he has a job and I'm still looking, anyway I wanted some booze so he said I could borrow it as long as I paid him back.

On my way up to the offy I couldn't find it, and I've somehow lost it which isnt good. Do I apologise to him or try and find a way to get £20 back for tonight?