TradeComissions

           string town = Console.ReadLine().ToLower();
            double volumeOfSales = double.Parse(Console.ReadLine());

            string sofiaTown = "sofia";
            string varnaTown = "varna";
            string plovdivTown = "plovdiv";
            double commision = -1.0;

            if (town == sofiaTown)
            {
                if (volumeOfSales >= 0 && volumeOfSales <= 500)
                {
                    commision = volumeOfSales * 0.05;
                }
                else if (volumeOfSales > 500 && volumeOfSales <= 1000)
                {
                    commision = volumeOfSales * 0.07;
                }
                else if (volumeOfSales > 1000 && volumeOfSales <= 10000)
                {
                    commision = volumeOfSales * 0.08;
                }
                else if (volumeOfSales > 10000)
                {
                    commision = volumeOfSales * 0.12;
                }
            }
            else if (town == varnaTown)
            {
                if (volumeOfSales >= 0 && volumeOfSales <= 500)
                {
                    commision = volumeOfSales * 0.45;
                }
                else if (volumeOfSales > 500 && volumeOfSales <= 1000)
                {
                    commision = volumeOfSales * 0.075;
                }
                else if (volumeOfSales > 1000 && volumeOfSales <= 10000)
                {
                    commision = volumeOfSales * 0.10;
                }
                else if (volumeOfSales > 10000)
                {
                    commision = volumeOfSales * 0.13;
                }
            }
            else if (town == plovdivTown)
            {
                if (volumeOfSales >= 0 && volumeOfSales <= 500)
                {
                    commision = volumeOfSales * 0.055;
                }
                else if (volumeOfSales > 500 && volumeOfSales <= 1000)
                {
                    commision = volumeOfSales * 0.08;
                }
                else if (volumeOfSales > 1000 && volumeOfSales <= 10000)
                {
                    commision = volumeOfSales * 0.12;
                }
                else if (volumeOfSales > 10000)
                {
                    commision = volumeOfSales * 0.145;
                }
            }
            if (commision < 0)
            {
                Console.WriteLine("error");
            }

            double volumeOfCommision = commision;
            Console.WriteLine($"{volumeOfCommision:f2}");
        }
    }
}