Pull it all together



i can't pull it all together
just says
Oops, try again. trip_cost('Pittsburgh', 1) raised an error: unsupported operand type(s) for -=: 'str' and 'int'

it wants me to use
def double(days)

def hotel_cost(days):
    return 140*days
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
def rental_car_cost(days):
# cost car $40 a day
    cost = 40 * days
    if days >=7:
         cost -=50
    elif days >= 3:
         cost -=20
    return cost
def trip_cost(days,city):
    return rental_car_cost(days) + hotel_cost(days) + plane_ride_cost(city)


The order of the arguments determines the order of the parameters.

The error is stating that your days parameter is a string when it should be a number.


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