gistfile1.txt

using System;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            var propertyValue = GetValidDecimalInput();
            var propertyTax = PropertyAssessment(propertyValue) * 0.0064m;

            Console.WriteLine(propertyTax);
        }

        static decimal GetValidDecimalInput()
        {
            decimal value;

            while (!Decimal.TryParse(Console.ReadLine(), out value))
            {
                Console.WriteLine("Please enter a decimal value.");
            }

            return value;
        }

        static decimal PropertyAssessment(decimal value)
        {
            return value * 0.6m;
        }
    }
}