9. The time costs generated by any premises in any accounting period shall (subject to paragraphs 10 and 11) be calculated by —
(a)multiplying the time (expressed in hours and fractions of an hour) spent by each inspector exercising official controls at those premises in the period by the hourly rate applicable to that inspector determined or varied in accordance with paragraphs 12 to 14;
(b)adding the results together; and
(c)adding any agreed slaughterhouse staff costs for the period.