static void Main(string[] args)
{
var prices = new[]
{
new ProductPrice("A", 1.25M, new VolumePrice(3M, 3)),
new ProductPrice("B", 4.25M),
new ProductPrice("C", 1.00M, new VolumePrice(5M, 6)),
new ProductPrice("D", 0.75M)
};
var terminal = new PointOfSaleTerminal(prices);
terminal.Scan("A");
terminal.Scan("A");
terminal.Scan("A");
terminal.Scan("A");
terminal.Scan("C");
terminal.Scan("D");
Console.WriteLine(terminal.PrintReceipt());
Console.WriteLine($"Total Price: {terminal.CalculateTotal()}");
}