771.2.3. For the purposes of sections 771.2.1.2 and 771.8.3, the amount by which the income of a corporation for a taxation year from an eligible business carried on by it exceeds its loss for the year from such a business shall be computed(a) as if the amount determined under subparagraph a of the first paragraph of section 737.18.3 in respect of the corporation for the year were nil; and
(b) as if the amount determined under subparagraph b of the first paragraph of section 737.18.3 in respect of the corporation for the year were, up to the amount that would, but for paragraph a, be determined under subparagraph a of that first paragraph in respect of the corporation for the year, nil.