(a) to ascertain the amount payable for a fortnight, the annual rate shall be divided by 313 and the result multiplied by 12;
(b) in the case of officers whose attendance on Sundays and holidays may be required without extra pay, the amount payable for a fortnight shall be ascertained by dividing the annual rate of pay by 365 and multiplying the result by 14;
(c) where officers are to be paid for a period less than a fortnight, payments shall be made on an hourly basis, the hourly rate of pay being ascertained by dividing a fortnight's pay by the number of hours prescribed for a fortnight's work;
(d) where wages are payable at a weekly rate, the payment for portion of a week shall be ascertained by dividing the amount of wages for a week by the average number of hours ordinarily constituting a week's work, and multiplying by the number of hours for which payment is made;
(e) in cases in which the Minister so determines, 1 month's pay shall be calculated as one-twelfth of the annual rate; and
(f) payment for part of a month shall be ascertained by multiplying the amount of pay for a month by the number of days comprised in the period for which payment is to be made and dividing by the number of days in the month.
(2) The initial payment of an increment of salary for a period of less than a fortnight may be calculated in any case in a manner approved by the Minister.