//returns the discount factor for a manufactorer for an airline and for a period
public static double GetAirlineManufactorerDiscountFactor(Airline airline, int length, bool forReputation)
{
double score;
if (forReputation)
score = 0.3*(1 + (int) airline.GetReputation());
else
score = 0.005*(1 + (int) airline.GetValue());
double discountFactor = (Convert.ToDouble(length)/20) + (score);
double discount = Math.Pow(discountFactor, 5);
if (discount > 30)
discount = length*3;
return discount;
}