using System; public class CheckAccount: BankAccount { public CheckAccount(string o, double ir): base(o, 0.0M, ir) { } public CheckAccount(string o, decimal b, double ir): base(o, b, ir) { } public override void Withdraw (decimal amount) { balance -= amount; if (amount < balance) interestRate = -0.10; } public override string ToString() { return owner + "'s check account holds " + + balance + " kroner"; } }