static void Main(string[] args)
{
Book actionBook = new Book("The House of Spies", "Daniel Silva", new DateTime(2016, 12, 11), 19.95m);
decimal price = actionBook.CalculateBookStorePrice();
Console.WriteLine($"Title: {actionBook.Title}");
Console.WriteLine($"Author: {actionBook.Author}");
Console.WriteLine($"Published On: {actionBook.PublishDate}");
Console.WriteLine($"Price: {price:C}");
Console.ReadLine();
}