public static void AddProductToCurrentSolution(Product productToAdd) { CurrentSolution.AddProductToSolution(productToAdd); subtotaltracker += productToAdd.Price; taxestracker = subtotaltracker * .0625; //MA Tax Rate finaltotaltracker = subtotaltracker * 1.0625; CurrentSolution.Subtotal = subtotaltracker.ToString(); CurrentSolution.Taxes = taxestracker.ToString(); CurrentSolution.FinalTotal = finaltotaltracker.ToString(); }