public IEnumerable <Tuple <ICustomer, decimal> > CreateCustomersAndCalcDiscounts()
{
var result = new List <Tuple <ICustomer, decimal> >();
decimal applePrice = 10;
var veteran = _warVeteransFactory.Create();
var student = _studentsFactory.Create();
var veteranDiscount = _warVeteransFactory.AddDiscount(veteran, applePrice);
var studentDiscount = _studentsFactory.AddDiscount(student, applePrice);
result.Add(Tuple.Create(veteran, veteranDiscount));
result.Add(Tuple.Create(student, studentDiscount));
return(result);
}