For the purposes of these formulas,(1) A is the net tax for the particular reporting period;
(2) B is the number of days in the particular reporting period;
(3) C is the total of all amounts each of which is the net tax for a reporting period of the registrant ending in the 12 month period immediately preceding the particular reporting period; and
(4) D is the number of days in the period commencing on the first day of the first of those preceding reporting periods and ending on the last day of the last of those preceding reporting periods.