Търговски комисионни

using System;

namespace tESt
{
    class Program
    {
        static void Main(string[] args)
        {

            var town = Console.ReadLine().ToLower();
            var sales = double.Parse(Console.ReadLine());
            double comission = 0;

            if (town == "sofia")
            {
                if (0 <= sales && sales <= 500)
                    comission = sales * 0.05;
                else if (500 <= sales && sales <= 1000)
                    comission = sales * 0.07;
                else if (1000 <= sales && sales <= 10000)
                    comission = sales * 0.08;
                else if (10000 <= sales )
                    comission = sales * 0.12;
                else
                    Console.WriteLine("error");
            }
            else if (town == "varna")
            {
                if (0 <= sales && sales <= 500)
                    comission = sales * 0.045;
                else if (500 <= sales && sales <= 1000)
                    comission = sales * 0.075;
                else if (1000 <= sales && sales <= 10000)
                    comission = sales * 0.10;
                else if (10000 <= sales)
                    comission = sales * 0.13;
                else
                    Console.WriteLine("error");
            }
            else if (town == "plovdiv")
            {
                if (0 <= sales && sales <= 500)
                    comission = sales * 0.055;
                else if (500 <= sales && sales <= 1000)
                    comission = sales * 0.08;
                else if (1000 <= sales && sales <= 10000)
                    comission = sales * 0.12;
                else if (10000 <= sales)
                    comission = sales * 0.145;
                else
                    Console.WriteLine("error");
            }
            else
            {
                Console.WriteLine("error");
            }

            if (comission > 0)
            {
                Console.WriteLine(comission);
            }
            else
            {

            }


        }
    }
}