In the formulas in the first paragraph,(a) A is the aggregate of all amounts each of which is an amount that the corporation purported to renounce in the particular calendar year under section 359.2 or 359.2.1, because of the application of section 359.8, in respect of expenses incurred or to be incurred in connection with production or potential production in Québec;
(b) B is the aggregate of all the expenses that are incurred by the corporation at or before the end of the month in the particular calendar year or in the subsequent calendar year and that relate to a renunciation in respect of which an amount is included in the aggregate referred to in subparagraph a;
(c) C is the rate of interest prescribed for the purposes of subsection 3 of section 164 of the Income Tax Act (R.S.C. 1985, c. 1 (5th Suppl.)) for the month; and
(d) D is 1 if the month for which a tax is determined under this Part for the subsequent taxation year is the month of December of that year, and zero in any other case.