Exchange rate determination: CBIC prescribes import and export currency conversion rates effective on the notified date for customs valuation. The Central Board fixes specific foreign currency conversion rates for customs purposes, with separate import and export columns, superseding the prior notification and effective from the stated date. Two annexed schedules set rates per one unit for listed currencies and per one hundred units for others; those schedule rates are to be applied for customs valuation and assessment of duties and obligations from the effective date.