105. Where, at the end of a taxation year, the amount determined under the second paragraph of section 107 in respect of a business of a taxpayer exceeds the aggregate of all amounts each of which is an amount determined under any of subparagraphs a to d of the first paragraph of that section in respect of that business, there shall be included in computing the taxpayer’s income from the business for the year the total of(a) the lesser of the excess and the amount determined at the end of the year in respect of the business under subparagraph a of the second paragraph of section 107; and
(b) the amount determined by the formula provided for in section 105.2.