Need some help on the following problem.

Write a class MortgageCalculator that extends the FinancialCalculator class. The compute method of this class prints out the total interest paid on a mortgage. The monthly payment is computed using this formula:

Monthy payment = Axr/n divided by 1 -[1/(1+r/n)^nT]

where A is the mortgage amount, r is the interest rate, n is the number of payments in a year, and T is the term of the mortgage in years. The total interest paid is calculated by taking the product of the monthly payment, the number of payments in a year n, and the term T. Write a program to test this class.

The FinancialCalculator class:

package inheritance; import java.util.*;

public abstract class FinancialCalculator { // calendar protected Calendar calendar;

// returns the number of days for the current month set on calendar protected int getDaysInMonth() { return calendar.getActualMaximum(Calendar.DAY_OF_MONTH); }

// returns the number of days in the current year set on calendar protected int getDaysInYear() { return calendar.getActualMaximum(Calendar.DAY_OF_YEAR); }

protected abstract void getUserInput(); protected abstract void compute(); }