4 For the purposes of any provision of the Customs Act and the Customs Tariff requiring interest to be paid, other than a provision for which section 3 applies, the prescribed rate of interest in effect during any quarter is the simple arithmetic mean (expressed as a percentage per year and rounded to the nearest one tenth of a percentage or, if the percentage is equidistant from two consecutive multiples of one tenth of a percentage, to the higher thereof) of all amounts each of which is the average equivalent yield (expressed as a percentage per year) of Government of Canada Treasury Bills that mature approximately three months after their date of issue and that were sold at auctions of Government of Canada Treasury Bills during the first month of the immediately preceding quarter.
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