public float CommodityTotalPrice()
        {//1.3
            Commodity[] commodities =
            {
                new Commodity()
                {
                    CommodityID = "A1", Price = 14
                },
                new Commodity()
                {
                    CommodityID = "A2", Price = 76.5f
                },
                new Commodity()
                {
                    CommodityID = "B2", Price = 34.4f
                },
                new Commodity()
                {
                    CommodityID = "C4", Price = 23.1f
                }
            };

            return(_Valuation.CommodityValuation(commodities));
        }