TradeComissionFixed

using System;

namespace SomeComplexConditionalStatements
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            string city = Console.ReadLine().ToLower();
            var sales = double.Parse(Console.ReadLine());
            double comission = -1.0;
            double totalbonus = (sales * comission);

            if (city == "sofia")
            {
                if (sales >= 0 && sales <= 500)
                {
                    comission = 0.05;
                }
                else if (sales > 500 && sales <= 1000)
                {
                    comission = 0.07;
                }
                else if (sales > 1000 && sales <= 10000)
                {
                    comission = 0.08;
                }
                else if (sales > 10000)
                {
                    comission = 0.12;
                }
            }
            else if (city == "varna")
            {
                if (sales >= 0 && sales <= 500)
                {
                    comission = 0.045;
                }
                else if (sales > 500 && sales <= 1000)
                {
                    comission = 0.075;
                }
                else if (sales > 1000 && sales <= 10000)
                {
                    comission = 0.10;
                }
                else if (sales > 10000)
                {
                    comission = 0.13;
                }
            }
            else if (city == "plovdiv")
            {
                if (sales >= 0 && sales <= 500)
                {
                    comission = 0.055;
                }
                else if (sales > 500 && sales <= 1000)
                {
                    comission = 0.08;
                }
                else if (sales > 1000 && sales <= 10000)
                {
                    comission = 0.12;
                }
                else if (sales > 10000)
                {
                    comission = 0.145;
                }
            }

            if (comission >= 0)
            {
                Console.WriteLine(Math.Round(sales * comission, 2));
            }
            else
            {
                Console.WriteLine("error");
            }
        }
    }
}