/// <summary>
 /// Public constructor that creates an instance of OldCar.
 /// </summary>
 /// <param name="licensePlateNo"></param>
 /// <param name="carMake"></param>
 /// <param name="purchasePrice"></param>
 /// <param name="type"></param>
 public OldCar(string licensePlateNo, string carMake, float purchasePrice, CarType type,
               DepreciationRecord record) : base(licensePlateNo, carMake,
                                                 purchasePrice, type)
 {
     _record = record;
 }
        /// <summary>
        /// Method to add an OldCar to the CarList.
        /// </summary>
        /// <param name="licensePlateNo"></param>
        /// <param name="carMake"></param>
        /// <param name="purchasePrice"></param>
        /// <param name="type"></param>
        /// <param name="record"></param>
        public void AddOldCar(string licensePlateNo, string carMake, float purchasePrice, CarType type, DepreciationRecord record)
        {
            Car car = new OldCar(licensePlateNo, carMake, purchasePrice, type, record);

            CarList.Add(car);
        }