51.0.1. The proportional share of the personal exemption or maximum contributory earnings of an employee for a year under a similar plan is equal to the amount obtained by multiplying the employee’s personal exemption or maximum contributory earnings, as the case may be, for the year under the plan by the proportion that(a) the aggregate of all amounts each of which is the employee’s pensionable salary and wages for the year in respect of pensionable employment under the similar plan, up to, for each of those amounts, the employee’s Maximum Pensionable Earnings for the year under the plan; is of
(b) the aggregate of all amounts each of which is the employee’s pensionable salary and wages for the year in respect of pensionable employment under this Act or the similar plan, up to, for each of those amounts, the employee’s Maximum Pensionable Earnings for the year under this Act or the similar plan, as the case may be.
For the purposes of subparagraph b of the first paragraph, where an employee is employed in a year in pensionable employment under both this Act and a similar plan, the total of the employee’s pensionable salary and wages for the year in respect of the employment may not exceed the employee’s Maximum Pensionable Earnings for the year under this Act.
Where the result obtained under the first paragraph is an amount that includes a fraction of a cent, the fraction is not taken into account if it is less than half of a cent and, in any other case, the fraction is counted as one cent.