Question 4
import java.util.Scanner;
class ElectricBill
{
    String n;
    int units;
    double bill;

    void accept()
    {
        Scanner scn = new Scanner(System.in);
        System.out.print("Enter Customer Name : ");
        n = scn.nextLine();
        System.out.print("Enter No. of Units consumed : ");
        units = scn.nextInt();     
    }

    void calculate()
    {
        if(units <= 100)
            bill = units*2.0;
        else if(units <=300)
            bill = 200.0+((units-100)*3.0);
        else if(units > 300)
        {
            bill = 200.0+600.0+((units-300)*5.0);
            double surchg = bill*2.5/100;
            bill=bill+surchg;
        }
    }

    void print()
    {
        System.out.println("Name of the customer : "+n);
        System.out.println("No. of units consumed : "+units);
        System.out.println("Bill amount : "+bill);
    }

    public static void main()
    {
        ElectricBill obj = new ElectricBill();
        obj.accept();
        obj.calculate();
        obj.print();
    }
}