package Ġjp . sg k . bus ines strip . domain . fee . a . trip čĊč Ċ import Ġjp . sg k . bus ines strip . domain . common . Fee č Ċ import Ġjp . sg k . bus ines strip . domain . fee . a . days . ID ay čĊč Ċ class ĠSt ay Over Trip : ĠTrip Ġ{ čĊĠĠĠ Ġval Ġdays Ġ= Ġmutable ListOf < ID ay >(); čĊčĊĠĠĠ Ġoverride Ġfun Ġcalc Fee () Ġ: ĠF ee Ġ{ čĊĠĠĠĠĠĠĠ Ġreturn ĠF ee ( 0 . 0 ) čĊĠĠĠ Ġ} č Ċ }