static void Main(string[] args)
{
var product = new Product("The Little Prince", 12345, Money.USDollar(20.25));
Console.WriteLine("---1. TAX---");
Console.WriteLine("");
var result = PriceCalculator.ForProduct(product).WithTaxRate(0.20M).GetResult();
Console.WriteLine($"Product price reported as {result.Subtotal()} before tax and {result.Total()} after {String.Format("{0:0%}", result.TaxRatePercent)} tax.");
result = PriceCalculator.ForProduct(product).WithTaxRate(0.21M).GetResult();
Console.WriteLine($"Product price reported as {result.Subtotal()} before tax and {result.Total()} after {String.Format("{0:0%}", result.TaxRatePercent)} tax.");
Console.WriteLine("");
Console.WriteLine("");
Console.WriteLine("");
Console.WriteLine("---2. DISCOUNT---");
Console.WriteLine("");
result = PriceCalculator.ForProduct(product).WithTaxRate(0.2M).WithDiscountRate(0.15M).GetResult();
Console.WriteLine($"Tax amount = {result.Tax()}; Discount amount = {result.Discount()}");
Console.WriteLine($"Price before = {result.Subtotal()}, price after = {result.Total()}");
Console.WriteLine("");
Console.WriteLine("");
Console.WriteLine("");
Console.ReadKey();
}