(1) Despite anything contained in this Act, where the total value of the goods of a non-commercial character, falling within 3 or more different Tariff Headings, either contained in passenger's accompanied baggage or imported by air, sea or parcel post, does not exceed $270, a flat rate of customs duty of 30% or such other rate as the Minister may by statutory instrument prescribe, shall be charged in lieu of the rate of customs duty prescribed in the Customs Tariff.