using System;

using System.Collections.Generic;

using System.Linq;

​

namespace SalesTaxTest

{

    class Program

    {

        public class Product

        {

            public double Qty { get; set; }

            public string Name { get; set; }

            public double Price { get; set; }

            public double Tax { get; set; }

            public Product(int qty, string name, double price, double tax)

            {

                this.Qty = qty;

                this.Name = name;

                this.Price = price;

                this.Tax = tax;

        }

​

            static void getTax(Product obj)

            {            

                    obj.Tax = obj.Qty * 10;

                    Console.WriteLine("{0} {1} at {2} Tax {3}", obj.Qty, obj.Name, obj.Price, obj.Tax);

            }

​

            static void Main(string[] args)

            {

                Console.WriteLine("Scenario 1:");

                List<Product> ProductList = new List<Product>();

                ProductList.Add(new Product(1, "book", 10, 5));

                ProductList.Add(new Product(1, "music CD", 20, 0));

​

                ProductList.ForEach(getTax);

                double res = ProductList.Sum(x => x.Tax);

                Console.WriteLine("Sales: " + res);

​

            }

        }

     }

}

​

​

​