public IList<Holding> Split(Percentage percentage)
{
IList<Holding> holdings = new List<Holding>();
Holding aHolding = GetSplittedHolding(percentage);
var aSecondHolding = GetSplittedHolding(percentage.RemainingPercentage);
holdings.Add(aHolding);
holdings.Add(aSecondHolding);
return holdings;
}