Untitled

import java.util.Scanner;
import java.text.DecimalFormat;

public class PayOffDebt {

    public static void main(String[] args) {

        Scanner keyboard = new Scanner(System.in);

        // Get User Input Of Principle, Annual Interest Rate, Monthly Payment,

        System.out.print("Principle:\t\t\t");
        double principle = keyboard.nextDouble();
        System.out.print("Annual Interest Rate (%):\t");
        double annualInterestRate = keyboard.nextDouble();
        System.out.print("Monthly Payment:\t\t");
        double monthlyPayment = keyboard.nextDouble();
        System.out.println();

        // Calculate raw value of months needed to pay off
        double rawMonthsNeededToPayOff = (Math.log(monthlyPayment) - Math.log(monthlyPayment - (annualInterestRate/1200.0) * principle))
                / Math.log((annualInterestRate / 1200.0) + 1);

        // Turning it into an integer type
        int monthsNeededToPayOff = (int)Math.ceil(rawMonthsNeededToPayOff);

        // Calculating totalAmountPaid, totalInterestPaid, overPayment
        double totalAmountPaid = monthlyPayment * monthsNeededToPayOff;
        double totalInterestPaid = totalAmountPaid - principle;
        double overPayment = (monthlyPayment * monthsNeededToPayOff) - (monthlyPayment * rawMonthsNeededToPayOff);

        // Define the format for the dollar amount to have two digits after the decimal point
        DecimalFormat df = new DecimalFormat("0.00");

        // Return the results
        System.out.println("Months Needed To Pay Off:\t" + monthsNeededToPayOff);
        System.out.println("Total Amount Paid:\t\t$" + df.format(totalAmountPaid));
        System.out.println("Total Interest Paid:\t\t$" + df.format(totalInterestPaid));
        System.out.println("Overpayment:\t\t\t$" + df.format(overPayment));

        keyboard.close();
    }
}