Section 64: Currency conversion.

(1) Chargeable income under this Act is calculat4ed in leones, subject to any other law relating to the conversion of other currency into leones. (2) Where the calculation of chargeable income involves an amount in a currency other than leones, the amount is converted at the exchange rate applying between the currency and leones on the date that the amount is paid, accrued or otherwise taken into account for tax purposes. (3) With the prior written permission of the Commissioner, a taxpayer may use the average rate of exchange during the year of assessment or may keep books of account in a currency other than leones.