130R57. A taxpayer may deduct, in respect of property of Class 39 in Schedule B, an amount not exceeding the amount obtained by applying to the undepreciated capital cost to the taxpayer of the property of that class at the end of the taxation year, computed before any deduction under this section for the year, the percentage represented by the aggregate of the following percentages:(a) 40% multiplied by the proportion that the number of days in the year that follow 31 December 1987 but that precede 1 January 1989, is of the number of days in the year that follow 31 December 1987;
(b) 35% multiplied by the proportion that the number of days in the year that follow 31 December 1988 but that precede 1 January 1990, is of the number of days in the year;
(c) 30% multiplied by the proportion that the number of days in the year that follow 31 December 1989 but that precede 1 January 1991, is of the number of days in the year; and
(d) 25% multiplied by the proportion that the number of days in the year that follow 31 December 1990, is of the number of days in the year.