static void Main(string[] args)
{
var person = new Person();
person.Assets.Add(new BankAccount {Amount = 1000, MonthlyInterest = 0.01});
person.Assets.Add(new BankAccount { Amount = 2000, MonthlyInterest = 0.02 });
person.Assets.Add(new RealEstate { EstimatedValue = 79000, MonthlyRent = 500 });
person.Assets.Add(new Loan { Owed = 40000, MonthlyPayment = 40 });
var netWorthVisitor = new NetWorthVisitor();
person.Accept(netWorthVisitor);
Console.WriteLine(netWorthVisitor.Total);
Console.ReadKey();
}