As used in this article, the average number of persons employed daily in the applicant's business during the previous year within the city shall be determined by ascertaining the total number of hours of service performed by all employees of the applicant within the city during the previous year and dividing the total number of hours of service thus obtained by the number of hours of service constituting a year's work of one full-time employee according to the custom or laws governing such employment. In computing the average number of persons employed, fractions of numbers shall be excluded. (Ord. 338 § 1(a), 1975).