Add a method to an inherited class
Let's add a method to the MortgageCalculator to calculate the monthly payment given a principal amount, an annual interest rate, and the number of years to pay off the loan.
This exercise is part of the course
Case Study: Building Software in Python
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
class MortgageCalculator(FinancialCalculator):
def __init__(self, loan_amount, annual_interest_rate, years):
super().__init__()
self.loan_amount = loan_amount
self.monthly_interest_rate = self.monthly_interest(annual_interest_rate)
self.months = self.multiply(years, 12)
self.monthly_payment = self.calculate_monthly_payment()
def calculate_monthly_payment(self):
numerator = self.monthly_interest_rate * (1 + self.monthly_interest_rate) ** self.months
denominator = (1 + self.monthly_interest_rate) ** self.months - 1
# Compute the quotient of numerator and denominator and save the result to multiplier
multiplier = self.divide(____, ____)