(a) in the case of a disposition by the taxpayer to a person referred to in section 90, deemed to be equal, at the time of disposition, for each unit of any particular quantity of such property, to the amount by which the average proceeds of disposition of a like unit that become receivable by that person in the month that includes the time of the disposition from a person other than a person referred to in section 90, exceeds the aggregate of i. the average aggregate of reasonable and necessary expenses, including depreciation, but not the cost of acquisition, incurred by that person referred to in section 90 in respect of such a unit for that month, that may reasonably be attributed to the transporting, marketing or processing of that unit, and
ii. in respect of the unit disposed of by the taxpayer, the amount that may reasonably be considered to be an amount that became receivable by Her Majesty in right of Canada for the use and benefit of a band as defined in the Indian Act (Revised Statutes of Canada, 1985, chapter I-5); and
(b) in the case of an acquisition by the taxpayer from a person referred to in section 90, computed without taking into account any law or contract requiring the taxpayer to acquire that property, and deemed to be equal, at the time of acquisition, for each unit of any particular quantity of such property, to the aggregate ofi. the amount paid or payable to the taxpayer by that person in respect of that unit, and
ii. the amount in respect of that unit paid or payable to Her Majesty in right of Canada by that person for the use and benefit of a band as defined in the Indian Act.