public CheckoutTotal CheckOut()
{
var preTaxTotal = _checkoutProducts.Sum(p => p.Price);
_total = new CheckoutTotal(preTaxTotal);
_total.CalculateTax(_state);
return _total;
}
public CashRegister()
{
_checkoutProducts = new List<Product>();
_total = null;
}
public Receipt(IEnumerable<Product> products, CheckoutTotal total)
{
_products = products;
_total = total;
}