116.2. A contributor’s average base monthly pensionable earnings are equal to G/N
G is the total base pensionable earnings of the contributor for each month included in his base contributory period,
N is the total number of months included in the contributor’s base contributory period or the following basic number, whichever is higher, depending on the benefit calculated:
(a) for the retirement pension, the basic number of base contributory months of the contributor, which is 120 less the number of months excluded from his base contributory period under subparagraph a or b of the third paragraph of section 101;
(b) for the disability pension, 24 months or, if the contributor’s disability date to qualify for the pension is prior to 1 July 1993, 60 months;
(c) for the surviving spouse’s pension or the death benefit, in respect of a contributor who died after 31 December 1993 and who was not, at the time of his death, the beneficiary of a retirement pension payable under this Act or a similar plan, 36 months.