In the formula in the first paragraph,(a) A is the total of the amounts determined in paragraphs b to e;
(b) B is the positive or negative amount, as the case may be, determined under section 818R16 in respect of the insurer for the first quarter of the year;
(c) C is the positive or negative amount, as the case may be, determined under section 818R16 in respect of the insurer for the second quarter of the year;
(d) D is the positive or negative amount, as the case may be, determined under section 818R16 in respect of the insurer for the third quarter of the year; and
(e) E is the positive or negative amount, as the case may be, determined under section 818R16 in respect of the insurer for the fourth quarter of the year;
(f) F is the quotient, rounded off to the next lower whole number where it is not a whole number, obtained by dividing the number of months in the taxation year by 3.