using System;

public class Program

{

    public static void Main()

    {

        var source = 145.40;

        Console.WriteLine($"Source:\tFloor:\tFloor2:\tRound:");

        for(double i = 0.01; i < 0.1; i += 0.01)

        {

            source += 0.01d;

            Console.WriteLine($"{source}\t{Floor(source)}\t{Floor2(source)}\t{Round(source)}");

        }

    }

    private static double Floor(double source)

    {

        return Math.Floor(source * 100d) / 100d;

    }

    private static double Floor2(double source)

    {

        source += Math.Pow(10,-10);

        return Math.Floor(source * 100d) / 100d;

    }

    private static double Round(double source)

    {

        return Math.Round(source, 2);

    }

}