it calls me to calculate the result of trip_cost, by adding a a third argument. but I don't know how to def the argument. Who can kindly tell me how to do it? thanks a lot!
def rental_car_cost(days): costs=40*days if days>=7: costs -=50 elif days>=3: costs -=20 return costs def hotel_cost(days): return days*140 def plane_ride_cost(city): if city=="Charlotte": return 183 elif city=="Tampa": return 220 elif city=="Pittsburgh": return 222 elif city=="Los Angeles": return 475 def trip_cost(city,days,spengding_money): return rental_car_cost(days) + hotel_cost(days) + plane_ride_cost(city)