Odd result in console

using System;

class Program
{

    // YOUR CODE HERE: Define a method named Multiply. Remember
    // to use the "static" and "void" keywords: "static void
    // Multiply" (without quotes). Multiply should take two
    // "double" values as parameters.
        static void Multiply (double first, double second)
        {
            Console.WriteLine(first * second);

        }

    static void Main(string[] args)
    {
        // YOUR CODE HERE:
        // Call Multiply with two arguments: 2.5 and 2.
        // YOUR CODE HERE:
        // Call Multiply with two arguments: 6 and 7.
            Multiply (2.5 , 2);
            Multiply(6 , 7);
    }


}