Program Code
 package assignment;

 import java.util.Scanner

public class BasicBill{
  public static void main(String[] args){
   double Output = 0;
   Scanner a = new Scanner(System.in);
   System.out.print("Enter the number of units: ");
   int input = a.nextInt();
   a.close();
   if(input<=100){
    output = input*1.20;
    System.out.println("\nThe Electricity Bill is: "+output);
   } else if(input<=300){
    output = 100*1.20+(input-100)*2;
    System.out.println("\nThe Electricity Bill is: "+output);
   } else if(input<=600){
    output = 100*1.20+200*2+(input-300)*3;
    System.out.println("\nThe Electricity Bill is: "+output);
   } else{
    output = 100*1.20+200*2+300*3+(input-300)*5;
    System.out.println("\nThe Electricity Bill is: "+output);
   }
  }
 }
Code Objective
Explanation
Console
Enter the number of units: