# mortgage.py

#

# Exercise 1.7

principal = 500000.0

rate = 0.05

payment = 2684.11

total_paid = 0.0

months = 0

extra_payment_start_month = 61

extra_payment_end_month = 108

extra_payment = 1000

while principal > 0:

if (months < extra_payment_start_month or months > extra_payment_end_month):

principal = principal * (1+rate/12) - payment

total_paid = total_paid + payment

else:

principal = principal * (1+rate/12) - payment - extra_payment

total_paid = total_paid + payment + extra_payment

print(round(total_paid,2),round(principal,2))

months += 1

print('Total paid', round(total_paid,2), '.')

print('Months: ', months)