using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

​

namespace PurchaseApp

{

    public class PurchaseCalc

    {

        public static void Main()

        {

            double itemAmnt, nItems = 0, sCharge, tax, gTotal, sTax = 0.10, tPurchase = 0.0;

            string answer = "y";

​

            Console.WriteLine("This application computes the total due for your purchases.");

            Console.WriteLine("It will allow you to enter any number of purchase amounts.");

            Console.WriteLine("When you are finished entering purchases, it displays the");

            Console.WriteLine("total due including sales tax and shipping charges.");

​

            while (answer.ToLower() == "y")

            {

                nItems++;

                Console.Write("\n\nWhat is the ammount of the item? ");

                itemAmnt = double.Parse(Console.ReadLine());

​

                tPurchase += itemAmnt;

​

                Console.WriteLine("\n\nDo you want to enter more purchases? - Y or N? ");

                answer = Console.ReadLine();

            }

​

            if (nItems < 3)

            {

                sCharge = 3.5;

            }

            else if (nItems <= 6)

            {

                sCharge = 5;

            }

            else if (nItems <= 10)

            {

                sCharge = 7;

            }

            else if (nItems <= 15)

            {

                sCharge = 9;

            }

            else

            {

                sCharge = 10;

            }

​

            tax = tPurchase * sTax;

            gTotal = tPurchase + tax + sCharge;

​

            Console.WriteLine("_______________________________________________");

            Console.WriteLine("\t\tSales Receipt");

            Console.WriteLine("Total Purchases: \t\t{0:C}", tPurchase);

            Console.WriteLine("Sales Tax: \t\t\t{0:C}", tax);

            Console.WriteLine("Number of Items Purchased: \t" + nItems);

            Console.WriteLine("Shipping charge: \t\t{0:C}", sCharge);

            Console.WriteLine("_______________________________________________");

            Console.WriteLine("Grand Total: \t\t{0:C}", gTotal);

        }

    }

}