I got the error message, "It looks like rental_car_cost returns 120 instead of the correct amount (100) for 3 days." I can't see how this is the problem, and I expect this to let 'days' get 50 dollars off if it's greater than or equal to 7. I also want it to give days 30 dollars off if it's greater than or equal to 3.
Here's the code:
def rental_car_cost(days): days * 40 if days >= 7: days += 50 elif day >= 3: day += 20 return days