Pull it together section 5

Oops, try again. trip_cost('Tampa', 8) returned 1390 instead of the correct value 1610

I'm really stuck, not sure where the problem is in my code? any help greatly appreciated... seem to be a problem with my trip_cost

```
def hotel_cost(nights):
return 140 * nights
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 cost - 50
elif days >= 3:
return cost - 20
else:
return cost
def trip_cost(city,days):
return rental_car_cost(days) + hotel_cost(days)
+ plane_ride_cost(city)
```