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where the taxpayer would have made a gain — or, if the pre-reversion debt was not on account of capital, would have had income — (referred to in this paragraph as the “hypothetical gain or income”) attributable to a fluctuation in the value of a currency if the pre-reversion debt had been settled by the taxpayer’s having paid, immediately before the end of its last functional currency year, an amount equal to the principal amount (expressed in the currency in which the pre-reversion debt is denominated, which currency is referred to in this subsection as the “debt currency”) at that time, the taxpayer is deemed to make a gain or to have income, as the case may be, for the reversionary year equal to the amount determined by the formula A × B/C where A is the amount of the hypothetical gain or income converted to Canadian currency using the relevant spot rate for the last day of the taxpayer’s last functional currency year, B is the amount of the particular payment (expressed in the debt currency), and C is the principal amount of the pre-reversion debt at the beginning of the taxpayer’s first reversionary year (expressed in the debt currency); and