13. The interest rate referred to in section 57 of the Act shall be calculated on the first day of each quarter as follows:(1) by establishing the simple arithmetic average of the basic rate for bank loans to firms published by the Bank of Canada on the last Wednesday of each month included in the 3-month period ending the second month of the previous quarter;
(2) by rounding off the results obtained in paragraph 1 to the nearest whole unit, and a half to the whole unit preceding it;
(3) by adding 2% to the results obtained in paragraph 2.