Versions of s. 45(1)(b)
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where property has, since it was acquired by a taxpayer, been regularly used in part for the purpose of gaining or producing income and in part for some other purpose, the taxpayer shall be deemed to have acquired, for that other purpose, the proportion of the property that the use regularly made of the property for that other purpose is of the whole use regularly made of the property at a cost to the taxpayer equal to the same proportion of the cost to the taxpayer of the whole property, and, if the property has, in such a case, been disposed of, the proceeds of disposition of the proportion of the property deemed to have been acquired for that other purpose shall be deemed to be the same proportion of the proceeds of disposition of the whole property;