219. The rate of interest applicable for the purposes of Chapters II and III of Title III is determined for each quarter of a calendar year, as follows:(1) by establishing the arithmetic mean of the prime business rate as published by the Bank of Canada on the last Wednesday of each of the months falling within the 3-month period ending in the second month of the preceding quarter;
(2) by rounding off the result obtained in paragraph 1 to the nearest whole number, the half being rounded down to the nearest whole number.