Taking a Vacation
Pull it Together

Great! Now that you've got your 3 main costs figured out, let's put them together in order to find the total cost of your trip.

``````def double(n):
return 2 * n
def triple(p):
return 3 * p

return double(a) + triple(b)
``````
1. We define two simple functions, `double(n)` and `triple(p)` that return 2 times or 3 times their input. Notice that they have `n` and `p` as their arguments.
2. We define a third function, `add(a, b)` that returns the sum of the previous two functions when called with `a` and `b`, respectively.
Instructions
1. Below your existing code, define a function called `trip_cost` that takes two arguments, `city` and `days`.
2. Like the example above, have your function return the sum of calling the `rental_car_cost(days)`, `hotel_cost(days)`, and `plane_ride_cost(city)` functions.

It is completely valid to call the `hotel_cost(nights)` function with the variable `days`. Just like the example above where we call `double(n)` with the variable `a`, we pass the value of `days` to the new function in the argument `nights`.

?
Stuck? Get a hint! Hint