156.3. The amount referred to in paragraph b of section 156.1 is, in respect of a corporation for a taxation year, equal to 20% of the amount determined in respect of the corporation for the year according to the following formula:
A × (B / C).
For the purposes of the formula provided in the first paragraph,(a) the letter A represents the amount deducted by the corporation, in computing its income for the year, under paragraph a of section 130 or the second paragraph of section 130.1 in respect of a prescribed depreciable property;
(b) the letter B represents the amount by which the aggregate of the business carried on in Canada or in Québec and elsewhere by the corporation in the year exceeds the business carried on in Québec by the corporation in the year;
(c) the letter C represents the aggregate of the business carried on in Canada or in Québec and elsewhere by the corporation in the year.