(b) to pay on or before a date specified in a notice of demand,-
(i) all duties and interest, if any, payable under sub- section (2) of section 61;
(ii) rent and charges claimable on account of such goods under this Act, together with interest on the same from the date so specified at the rate of six per cent. per annum or such other rate as is for the time being fixed by the Board; and