Nothing is printing to the screen


    def rental_car_cost(days):
            cost = 40*days
            if days>=7:
               cost -= 50
            elif days>=3:
                 cost -= 20
            return cost
  def hotel_cost(nights):
    return 140*nights 
def trip_cost(city,days,spending_money):
       return rental_car_cost(days)+hotel_cost(days)+plane_ride_cost(city)+spending_money
       result = trip_cost(city,days,spending_money)
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
            return 0    
        print trip_cost("Los Angeles",5,600)

Nothing is getting printed on the console any reason why?

7. Plan Your Trip! - Why replacing hotel_cost(nights) with hotel_cost(days) works?

The above line is indented in the code, making it part of the plane_ride_cost function. Remove the indentation.

There are a couple of stray lines that could be removed or commented out.