// Stores the cost and charges of a single retail product.
        public static List <double> RetailTax(Product product)
        {
            // Holds the product's charges and costs.
            List <double> retailTaxes = new List <double>();

            // Variables for the tax amount's I found for cumberland county.
            double stateTax      = 0.0475;
            double countyTax     = .0225;
            double bringItCharge = .05;

            // Adds all charges and costs to the list.
            retailTaxes.Add(bringItCharge *= product.Cost);
            retailTaxes.Add(stateTax      *= product.Cost);
            retailTaxes.Add(countyTax     *= product.Cost);
            retailTaxes.Add(product.Cost);

            // Prints a reciept of the product.
            StandardMessages.ProductReciept(product, bringItCharge, stateTax, countyTax);

            return(retailTaxes);
        }
        // Creates a reciept based on all products cost and charges added together.
        public static void TotalSales(List <List <double> > collectionOfCosts, List <Product> product)
        {
            double totalCost = 0;

            // Used just incase something went horribly wrong and a product got through that had no information. Should never happen.
            if (product is null)
            {
                Console.WriteLine("There was no products listed");
            }
            else
            {
                // Used 2 loops because of the List being nested in one another. Takes each individual cost and adds them together to produce a total sales cost for the user.
                foreach (List <double> productCost in collectionOfCosts)
                {
                    foreach (double salesCost in productCost)
                    {
                        totalCost += salesCost;
                    }
                }
                // Displays the Final Cost receipt.
                StandardMessages.TotalCostReceipt(totalCost);
            }
        }
        // Stores the cost and charges of a single food product.
        public static List <double> FoodTax(Product product)
        {
            // Holds the product's charges and costs.
            List <double> foodTaxes = new List <double>();

            // Variables for the tax amount's I found for cumberland county.
            double stateTax             = 0.0475;
            double countyTax            = .0325;
            double serviceChargeStore   = .1;
            double serviceChargeBringIt = .1;

            // Adds all charges and costs to the list.
            foodTaxes.Add(serviceChargeBringIt *= product.Cost);
            foodTaxes.Add(serviceChargeStore   *= product.Cost);
            foodTaxes.Add(stateTax             *= (serviceChargeBringIt + product.Cost + serviceChargeStore));
            foodTaxes.Add(countyTax            *= (serviceChargeBringIt + product.Cost + serviceChargeStore));
            foodTaxes.Add(product.Cost);

            // Prints a reciept of the product.
            StandardMessages.ProductReciept(product, serviceChargeBringIt + serviceChargeStore, stateTax, countyTax);

            return(foodTaxes);
        }