(a) eight days for every twelve months of continuous service with the same employer if he has been employed by that employer for a period of less than two years;
(b) twelve days for every twelve months of continuous service with the same employer if he has been employed by that employer for a period of two years or more but less than five years; and
(c ) sixteen days for every twelve months of continuous service with the same employer if he has been employed by that employer for a period of five years or more;
and if he has not completed twelve months of continuous service with the same employer during the year in which his contract of service terminates, his entitlement to paid annual leave shall be in direct proportion to the number of completed months of service: