public override double CalculateInterestAmount(int number_of_months)
{
if (Customer.GetType().Name == "CompaniesCustomer")
{
if (number_of_months <= InterestMonthsCompanies)
{
return((this.InterestRate * number_of_months) / 2);
}
}
if (Customer.GetType().Name == "IndividualCustomer")
{
if (number_of_months <= InterestMonthsIndividuals)
{
throw new ArgumentException(NoInterestIndividual);
}
}
return(this.InterestRate * number_of_months);
}