"Valuation of goods for purposes of assessment: (1) For the purposes of the (51 of 1975), or any other law for the time being in force whereun der a duty of customs is chargeable on any goods by refer ence to their value, the value of such goods shall be deemed to be the price at which such or like goods are ordinarily sold, or offered for sale, for delivery at the time and place of importation or exportation, as the case may be, in the course of international trade, where the seller and the buyer have no interest in the business of each other and the price is the sole consideration for the sale or offer for sale: Provided that such price shall be calculated with reference to the rate of exchange as in force on the date on which a bill of entry is presented under Section 46, or a shipping bill or bill of export, as the case may be, is presented under Section 50." According to the above provision the value of the goods shall be deemed to be the price at which such or like goods are ordinarily sold, or offered for sale, for delivery at the time and place of importation, in the course of interna tional trade where the seller and the buyer have no interest in the business of each other and the price is the sole consideration for the sale or offer for sale.