using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

         try

         {

             double totalBill = 0, salesTax = 0;

             List<Product> productList = getProductList();

             foreach (Product prod in productList)

             {

                 double tax = prod.ComputeSalesTax();

                 salesTax += tax;

                 totalBill += tax + (prod.Quantity * prod.ProductPrice);

                 Console.WriteLine(string.Format("Item = {0} : Quantity = {1} : Price = {2} : Tax = {3}", prod.ProductName, prod.Quantity, prod.ProductPrice + tax, tax));

             }

             Console.WriteLine("Total Tax : " + salesTax);

             Console.WriteLine("Total Bill : " + totalBill);                

        }

         catch (Exception ex)

         {

             Console.WriteLine(ex.Message);

         }

         Console.ReadLine();

     }

​

    private static List<Product> getProductList()

     {

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

         //input 1

         lstProducts.Add(new Product("Book", 12.49, 1, ProductType.ExemptedProduct, false));

         lstProducts.Add(new Product("Music CD", 14.99, 1, ProductType.TaxPaidProduct, false));

         lstProducts.Add(new Product("Chocolate Bar", .85, 1, ProductType.ExemptedProduct, false));

​

        //input 2

         lstProducts.Add(new Product("Imported Chocolate", 10, 1, ProductType.ExemptedProduct,true));

         lstProducts.Add(new Product("Imported Perfume", 47.50, 1, ProductType.TaxPaidProduct,true));

​

        //input 3

         lstProducts.Add(new Product("Imported Perfume", 27.99, 1, ProductType.TaxPaidProduct,true));

         lstProducts.Add(new Product("Perfume", 18.99, 1, ProductType.TaxPaidProduct,false));

         lstProducts.Add(new Product("Headache Pills", 9.75, 1, ProductType.ExemptedProduct,false));

         lstProducts.Add(new Product("Imported Chocolate", 11.25, 1, ProductType.ExemptedProduct,true));

         return lstProducts;

     }

 }

​

public enum ProductType

 {

     ExemptedProduct=1,

     TaxPaidProduct=2,

 }

​

class Product

 {

     private ProductType _typeOfProduct = ProductType.TaxPaidProduct;

     private string _productName = string.Empty;

     private double _productPrice;

     private int _quantity;

     private bool _isImportedProduct = false;

​

    public string ProductName { get { return _productName; } }

     public double ProductPrice { get { return _productPrice; } }

     public int Quantity { get { return _quantity; } }

​

    public Product(string productName, double productPrice,int quantity, ProductType type, bool isImportedProduct)

     {

         _productName = productName;

         _productPrice = productPrice;

         _quantity = quantity;

         _typeOfProduct = type;

         _isImportedProduct = isImportedProduct;

     }

​

    public double ComputeSalesTax()

     {

         double tax = 0;

         if(_isImportedProduct) //charge 5% tax directly

             tax+=_productPrice*.05;

         switch (_typeOfProduct)

         {

             case ProductType.ExemptedProduct: break;

             case ProductType.TaxPaidProduct:

                 tax += _productPrice * .10;

                 break;

         }

         return Math.Round(tax, 2);  //round result before returning

     }

​

}

​