418.29. The amount referred to in paragraph f of section 418.26 and which shall not be exceeded is the amount equal to the part of the income of the transferor for the year referred to in that paragraph, before any deduction under sections 359 to 419.6, that may reasonably be regarded as attributable(a) to the production from a foreign resource property owned by the transferor immediately before the time referred to in section 418.26, and
(b) to the disposition of a foreign resource property owned by the transferor immediately before the time referred to in section 418.26.