5.—(1) If the additional sum for an authority for the relevant year as calculated under paragraph 4–
(a)exceeds 140 per cent. of the amount for that authority for that year calculated under paragraph 3(2), the additional sum for that authority for that year shall be 140 per cent. of such amount; or
(b)is less than 90 per cent. of the amount for that authority for that year calculated under paragraph 3(2), the additional sum for that authority for that year shall be 90 per cent. of such amount.