Operator (*) Cannot be applied to operands of type 'object' and 'double'
<p>This is my code. I can not understand what is the problem, but Visual Studio 2008 says that </p>

<blockquote>
  <p>Operator (*) Cannot be applied to operands of type 'object' and
  'double'</p>
</blockquote>

<p>Thanks ...</p>

<pre><code>#region Using directives

using System;
using System.Collections.Generic;
using System.Text;

#endregion

namespace DailyRate
{
    class Program
    {
        static void Main(string[] args)
        {
            (new Program()).run();
        }

        public void run()
        {
            double dailyRate = readDouble("Enter your daily rate: ");
            int noOfDays = readInt("Enter the number of days: ");
            writeFree(CalculateFee(dailyRate, noOfDays));
        }

        private void writeFree(object p)
        {
            Console.WriteLine("The consultant's fee is: {0}", p * 1.1);
        }

        private double CalculateFee(double dailyRate, int noOfDays)
        {
            return dailyRate * noOfDays;
        }

        private int readInt(string p)
        {
            Console.Write(p);
            string line = Console.ReadLine();
            return int.Parse(line);
        }

        private double readDouble(string p)
        {
            Console.Write(p);
            string line = Console.ReadLine();
            return double.Parse(line);
        }
    }
}
</code></pre>
