using System;

public class Program

{

    public static void Main()

    {

        var fourPlaces = 0.5485M;

        var twoPlaces = fourPlaces - (fourPlaces % 0.01M);

        Console.WriteLine("Hello World");

        Console.WriteLine(Truncate(fourPlaces));

        Console.WriteLine(twoPlaces);

    }

    static decimal Truncate(decimal d)

{

        byte decimals = 2;

    decimal r = Math.Round(d, decimals);

​

    if (d > 0 && r > d)

    {

        return r - new decimal(1, 0, 0, false, decimals);

    }

    else if (d < 0 && r < d)

    {

        return r + new decimal(1, 0, 0, false, decimals);

    }

​

    return r;

}

}