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where the taxpayer would have sustained a loss — or, if the pre-reversion debt was not on account of capital, would have had a loss — (referred to in this paragraph as the “hypothetical loss”) 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 debt currency) at that time, the taxpayer is deemed to sustain or to have a loss in respect of the particular payment for the reversionary year equal to the amount that would be determined by the formula in paragraph (a) if the reference in the description of A in that paragraph to “hypothetical gain or income” were read as a reference to “hypothetical loss”.