The maximum rate of levy that may be fixed in respect of the 2 classes of levy is,—
(a) for the class 1 rate, 1.75% of the selling price, of the FOB value, or of the notional process value, as the case may be:
(b) for the class 2 rate, 1.0% of the selling price, of the FOB value, or of the notional process value, as the case may be.