just a codecademy exercise that I'm using to teach my brother how to program :)

codecademy_exercise.py

def hotel_cost(nights):
    return nights * 140

bill = hotel_cost(5)

def add_monthly_interest(balance):
    return balance * (1 + (0.15 / 12))

def make_payment(payment, balance):
    # In make_payment, you should first subtract payment from balance
    new_balance = balance - payment
    # Then, call the function add_monthly_interest() with the new value.
    new_balance = add_monthly_interest(new_balance)
    #  The return value you get from calling add_monthly_interest() should be returned
    print "You still owe: %s" % new_balance

    return new_balance


# To calculate how much we still owe, we will need to call make_payment twice.
# First, save the total hotel bill. (We already did that on line 4.)
# Next, call make_payment with bill as the balance and bill / 2 as the payment.
# Save this value as new_bill.
new_bill = make_payment(bill / 2, bill)
# Finally, call make_payment again with new_bill as the balance and 100 as the payment
make_payment(100, new_bill)