. . "The buyer shall be liable to pay any import fees, duties, taxes, and other imposts or charges which are payable in relation to buyers order. 5.4 Variation (a) Where the buyer and the seller agree to a variation in the quantity of the goods, the goods shall be priced either at the rate applicable to the original quantity or the revised quantity at the absolute discretion of the seller. (b) The sell" . . . . .