def cost_of_city(return_flight, hotel_per_week, weekly_car_rental):
    week_cost = return_flight + hotel_per_week + weekly_car_rental
    return week_cost
    

 week_cost1 = cost_of_city(
    return_flight = 200,
    hotel_per_week = 20*7,#weekly cost
    weekly_car_rental = 200
)

week_cost2 = cost_of_city(
    return_flight = 250,
    hotel_per_week = 30*7,#weekly cost
    weekly_car_rental = 120
)

week_cost3 = cost_of_city(
    return_flight = 370,
    hotel_per_week = 15*7,#weekly cost
    weekly_car_rental = 80
)

week_cost4 = cost_of_city(
    return_flight = 450,
    hotel_per_week = 10*7,#weekly cost
    weekly_car_rental = 70
)