# mortgage.py

#

# Exercise 1.7

principal = 500000.0

rate = 0.05

payment = 2684.11

total_paid = 0.0

months = 0

extra_payment = 1000.0

extra_payment_start_month = 61

extra_payment_end_month = 108

while principal > 0:

months += 1

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

total_paid = total_paid + payment

# Apply extra payment if within the specified months

if months >= extra_payment_start_month and months <= extra_payment_end_month:

principal = principal - extra_payment

total_paid = total_paid + extra_payment

# Ensure we don't pay more than the remaining principal

if principal < 0:

total_paid = total_paid + principal # Adjust final payment

principal = 0.0 # To avoid negative principal in final month

print(f"{months} {total_paid:.2f} {principal:.2f} ")

print(f"Total paid {total_paid:.2f}")

print(f"Months {months} or {months // 12} years and {months % 12} months")