Simple Electricity Bill Calculator

import java.util.Scanner;


public class Ebill {

    public static void main(String args[]) {

        // Declaring variables
        int pres, past, units, rate, bill;

        Scanner Obj = new Scanner(System.in);

        // Getting user inputs
        System.out.println("Enter present meter reading: ");
        pres = Obj.nextInt();

        System.out.println("Enter past meter reading:");
        past = Obj.nextInt();
        String s = Obj.nextLine();

        System.out.println("Enter unit rate:");
        rate = Obj.nextInt();

        // Calculating consumed units
        units = pres - past;

        // Calculating the monthly bill
        if (units <= 40) {

            bill = units * rate;

        } else {

            bill = 40 * rate + (units - 40) * (rate * 2);
        }

        // Printing the consumed number of units and the bill
        System.out.println("Number of units consumed is " + units);
        System.out.println("Electricity bill for the month is " + bill);
        System.out.println(s);

    }

}