using System;

public static class Assingment 

{

    public static void Main()

    {

        string Lastname;

        int NumofDount;

        double Cost, Total;

        const double TAX = 1.13;

        const double cover_charge = 0.25;

​

        Console.Write("Enter your last name: ");

        Lastname = Console.ReadLine(); //For Lastname of Customer

        Console.WriteLine("Get Tax free donuts on buying 12 or more donuts");

        Console.Write("Enter the number of donuts you want to buy:");

        NumofDount = Convert.ToInt32(Console.ReadLine());

​

​

        if (NumofDount>0)

        {

            //Effective Cost of donuts

​

            if (NumofDount == 1)

            {

                Cost = 2;

​

            }

            else if (NumofDount <= 4)

            {

                Cost = 1.75;

            }

            else if (NumofDount < 10)

            {

                Cost = 1.50;

​

            }

            else if (NumofDount >= 10)

            {

                Cost = 1;

            }

            if (NumofDount >= 12)

            {

                Total = (NumofDount * Cost) + cover_charge;

            }

            else

            {

                Total = (NumofDount * Cost * TAX) + cover_charge;

            }

            Console.WriteLine("Wellcome {0}, you have purchesed {1} and your payabale bill is {2:C}", Lastname, NumofDount, Total);

        }

        else

        {

            Console.WriteLine("Please add mimimum 1 dount to buy.");

        }

​

​

    }

​

​

​

​

​

​

}

​