Section 102

ll) Where any new import duty is imposed or where any such duty is increased, and any goods in respect of which the duty is payable are delivered after the day on which the new or increased duty takes effect, in pursuance of a contract made before such day, the seller of the goods may, in the absence of agreement to the contrary, recover from the purchaser of the goods, as an addition to the contract price, a sum equal to any amount paid by him in respect of the goods on account of the new duty or increase of duty, as the case may be.

Where any import duty is cancelled or decreased and any goods affected by the duty are delivered after the day on which the duty is cancelled or the decrease in the duty takes effect, in pursuance of a contract made before such day, the purchaser of the goods may, in the absence of the agreement to the contrary, if the seller of the goods has had in respect of those goods the benefit of the cancellation or decrease of the duty, deduct from the contract price a sum equal to the amount of the duty or decrease of duty, as the case may be.