//Use the State Pattern.
//The Runner class creates the Context object invokes methods on the Context class (object).

Context context = new Context("Jim Johnson");

context.Deposit(500.00);
context.PayInterest();
context.Deposit(300.00);
context.Deposit(550.00);
context.PayInterest();
context.Withdraw(2000.00);
context.Withdraw(1100.00);