Where requested by a teacher the Board shall deduct from the teacher's monthly salary an amount and deposit said amount in the Payroll Savings Plan, administered by the Minnedosa Credit Union Ltd., according to the following provisions:
(a) that each teacher requesting such deduction inform the Secretary-Treasurer between September 1 and September 15 of the constant amount to be deducted from each monthly cheque during the school year.
(b) that the Board submit to the said Payroll Savings Plan the total amounts deducted each month during the school year.