using System;

public class Program

{

    public static void Main()

    {

        var amount = 304.009801000m;

        var arredondado = RoundDown(amount, 2);

        Console.Write(arredondado);

    }

    public static decimal RoundDown(decimal i, double decimalPlaces)

    {

       var power = Convert.ToDecimal(Math.Pow(10, decimalPlaces));

       return Math.Floor(i * power) / power;

    }

}