Hello , I m stuck at this exercise . I m constantly getting this error

Oops, try again. rental_car_cost(1) returned 20 instead of the correct value 40

I dont know what to change.

Even if i call the function at the end i get the same message .

Can anyone help me please ?

```
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
def rental_car_cost(days):
cost = 40 * days
if days >= 7 :
return - 50
elif days >= 3 and days <7 :
return - 20
def trip_cost(days , city ):
return rental_car_cost(days) + hotel_cost(days) + plane_ride_cost(city)
```