Each year starts on one of the seven days (Sunday through Saturday). Each year is either a leap year(i.e., it includes February 29th) or not. How many different calendars are possible for a year?

Solution: Year starts on Sunday through Saturday = 7 days
                Year either leap year or not i.e. 2 different years.
                Therefore total number of calenders possible for a year = 7 x 2 = 14