public void Apply(Calculation calculation)
{
rules
.Where(r => r.Applies(calculation))
.ForEach(r => r.Apply(calculation));
}
private void ApplyDiscounts(Calculation calculation)
{
DiscountMarkupRules.Apply(calculation);
}
private void UpdateTotals(Calculation calculation)
{
calculation.UpdateTotal();
}
public abstract Calculation Apply(Calculation calculation);
