using System;

public class Program

{

    public static void Main()

    {

        decimal ValueTotal = 0m;

        decimal ValueOilChange = 0m;

        decimal ValueOilLube = 0m;

        decimal result = OilLubeCharges(ref ValueTotal, ref ValueOilChange, ref ValueOilLube);

        Console.WriteLine(result);

        Console.WriteLine(ValueTotal);

        Console.WriteLine(ValueOilChange);

        Console.WriteLine(ValueOilLube);

    }

    private static decimal OilLubeCharges(ref decimal ValueTotal, ref decimal ValueOilChange, ref decimal ValueOilLube )

    {

        ValueTotal = 5m;

        //ValueOilChange = 10m;

        ValueOilLube = 12m;

        return 100m;

    }

​

}