Define a class Telephone having the following description:

Class name : Telephone

Data Members	Purpose
int prv, pre	to store the previous and present meter readings
int call	to store the calls made (i.e. pre - prv)
String name	to store name of the consumer
double amt	to store the amount
double total	to store the total amount to be paid

Member functions	Purpose
void input()	Stores the previous reading, present reading and name of the consumer
void cal()	Calculates the amount and total amount to be paid
void display()	Displays the name of the consumer, calls made, amount and total amount to be paid

Write a program to compute the monthly bill to be paid according to the given conditions and display the output as per the given format.

Calls made	Rate
Up to 100 calls	No charge
For the next 100 calls	90 paise per call
For the next 200 calls	80 paise per call
More than 400 calls	70 paise per call

However, every consumer has to pay ₹180 per month as monthly rent for availing the service.

Output:

Name of the customer    Calls made  Amount to be paid
....................    ..........  .................
....................    ..........  .................

import java.util.Scanner;

public class Telephone
{
    private int prv;
    private int pre;
    private int call;
    private String name;
    private double amt;
    private double total;
    
    public void input() {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter Customer Name: ");
        name = in.nextLine();
        System.out.print("Enter previous reading: ");
        prv = in.nextInt();
        System.out.print("Enter present reading: ");
        pre = in.nextInt();
    }
    
    public void cal() {
        call = pre - prv;
        if (call <= 100)
            amt = 0;
        else if (call <= 200)
            amt = (call - 100) * 0.9;
        else if (call <= 400)
            amt = (100 * 0.9) + (call - 200) * 0.8;
        else
            amt = (100 * 0.9) + (200 * 0.8) + ((call - 400) * 0.7);
            
        total = amt + 180;
    }
    
    public void display() {
        System.out.println("Name of the customer\tCalls made\tAmount to be paid");
        System.out.println(name + "\t" + call + "\t" + total);
    }
    
    public static void main(String args[]) {
        Telephone obj = new Telephone();
        obj.input();
        obj.cal();
        obj.display();
    }
}