92.22. Where, in a taxation year, a taxpayer disposes of a property described in his inventory and an amount has been deducted under section 141 in respect of the property in computing his income for the year or a preceding taxation year, he shall include in computing his income for the year from the business in which the property was used or held, the amount by which(a) the aggregate of all amounts each of which is an amount deducted by him under section 141 in respect of the property in computing his income for the year or a preceding taxation year, exceeds
(b) the aggregate of all amounts each of which is an amount included by him under paragraph i of section 87 in respect of the property in computing his income for the year or a preceding taxation year.