12. Trade Commissions

string city = Console.ReadLine();
double sales = double.Parse(Console.ReadLine());

if (city == "Sofia")
{
    if (sales < 0)
    {
        Console.WriteLine("error");
    }
    else if (sales >= 0 && sales <=500)
    {
        Console.WriteLine($"{sales * 0.05:F2}");
    }
    else if (sales > 500 && sales <= 1000)
    {
        Console.WriteLine($"{sales * 0.07:F2}");
    }else if (sales > 1000 && sales <= 10000)
    {
        Console.WriteLine($"{sales * 0.08:F2}");
    }else if (sales > 10000)
    {
        Console.WriteLine($"{sales * 0.12:F2}");
    }
}
else if (city == "Varna")
{
    if (sales < 0)
    {
        Console.WriteLine("error");
    }
    else if (sales >= 0 && sales <= 500)
    {
        Console.WriteLine($"{sales * 0.045:F2}");
    }
    else if (sales > 500 && sales <= 1000)
    {
        Console.WriteLine($"{sales * 0.075:F2}");
    }
    else if (sales > 1000 && sales <= 10000)
    {
        Console.WriteLine($"{sales * 0.1:F2}");
    }
    else if (sales > 10000)
    {
        Console.WriteLine($"{sales * 0.13:F2}");
    }
}
else if (city == "Plovdiv")
{
    if (sales < 0)
    {
        Console.WriteLine("error");
    }
    else if (sales >= 0 && sales <= 500)
    {
        Console.WriteLine($"{sales * 0.055:F2}");
    }
    else if (sales > 500 && sales <= 1000)
    {
        Console.WriteLine($"{sales * 0.08:F2}");
    }
    else if (sales > 1000 && sales <= 10000)
    {
        Console.WriteLine($"{sales * 0.12:F2}");
    }
    else if (sales > 10000)
    {
        Console.WriteLine($"{sales * 0.145:F2}");
    }
}
else if(city != "Sofia" && city != "Varna" && city != "Plovdiv")
{
    Console.WriteLine("error");
}