Why dont work?


#1
def rental_car_cost(days):
    rent_cost=40*days
    if days >= 7:
        return rent_cost += 50
    elif days > 3:
        return rent_cost += 20

Say to mi File "python", line 19
return rent_cost += 50
^
SyntaxError: invalid syntax


#2

you are adding the descount