public void DisplayInfo()
{
Console.WriteLine("Additional dock info: ");
Console.WriteLine();
int row = Boats
.OfType <RowingBoat>()
.Count();
int pow = Boats
.OfType <PowerBoat>()
.Count();
int sail = Boats
.OfType <SailBoat>()
.Count();
int cata = Boats
.OfType <Catamaran>()
.Count();
int carg = Boats
.OfType <CargoShip>()
.Count();
var weight = Boats
.GroupBy(b => b.Weight)
.Sum(b => b.Key);
var speed = Boats
.GroupBy(b => b.MaxSpeed)
.Sum(b => b.Key);
var emptySlot = Docks
.Count(b => b == null);
int speedInKMH = speed / Boats.Count();
Console.WriteLine("Number of docked boats: ");
Console.WriteLine($"Rowingboat: {row}");
Console.WriteLine($"Powerboat: {pow}");
Console.WriteLine($"Sailboat: {sail}");
Console.WriteLine($"Catamaran: {cata}");
Console.WriteLine($"Cargoship: {carg}");
Console.WriteLine($"Total weight in dock: {weight} kg");
Console.WriteLine($"Average maximum speed in dock: {(speedInKMH * 1.85200)} km/h");
Console.WriteLine($"Empty slots in dock: {emptySlot/2}");
Console.WriteLine($"Number of total boats added: {AddedBoats}");
Console.WriteLine($"Number of total boats rejected: {RejectedBoats}");
}