static void Main(string[] args) { const decimal OPENING_BALANCE = 55m; const decimal MONTHLY_INTEREST = 0.0033m; //add monthly interest to savings account and display balance Savings savings = new Savings(OPENING_BALANCE); savings.AddMonthlyInterest(MONTHLY_INTEREST); savings.ShowBalance(); //deduct the monthly check fee from the account balance and display balance Checking checking = new Checking(OPENING_BALANCE); checking.DeductServiceCharge(); checking.ShowBalance(); //show the 2 owners of the joint account, plus add interest to the balance and display the balance JointSavings jointSavings = new JointSavings("Bob", "Martha", OPENING_BALANCE); jointSavings.ShowOwners(); jointSavings.AddMonthlyInterest(MONTHLY_INTEREST); jointSavings.ShowBalance(); Console.ReadKey(); }