weeks worked by a claimant.  In <u>Norampac</u>, for example, the Board reported that the claimant’s payroll showed 29 “five-day” weeks, 13 “four-day” weeks and 4 “three-day weeks” while the balance of the payroll was absence due to disability or vacation.  The Board held that “clearly the majority of the weeks worked by the claimant during the year preceding his work accident were five-day weeks” and imposed a 260 multiple.