/// <summary>
 /// Constructor for the class MortrageAccount
 /// </summary>
 /// <param name="Cust">A customer object</param>
 /// <param name="Balance">Account balance</param>
 /// <param name="InterestRate">Interest Rate</param>
 public MortrageAccount(Customer Cust, double Balance, double InterestRate)
 {
     cust = Cust;
     balance = Balance;
     interestRate = InterestRate;
 }
 /// <summary>
 /// Constructor for the class DepositAccount
 /// </summary>
 /// <param name="Cust">A customer object</param>
 /// <param name="Balance">Account balance</param>
 /// <param name="InterestRate">Interest rate</param>
 public DepositAccount(Customer Cust, double Balance, double InterestRate)
 {
     cust = Cust;
     balance = Balance;
     interestRate = InterestRate;
 }