using System;

public class Program

{

    public static void Main()

    {   

        string value = "67%";       

        value = value.Replace("%","");      

​

        decimal outValue;

        if (decimal.TryParse(value, out outValue))

        {

            Console.WriteLine(outValue / 100);

        } else {

            Console.WriteLine("TryParse failed: " + value);

        }

    }

}