Exemption threshold amendment reduces prior percentage under customs notification, altering the scope of exemption and entering into force. An amendment substitutes the preamble percentage in Notification No. 85/2004-Customs with twenty five per cent. The change is effected under sub-section (1) of section 25 of the Customs Act, 1962, as necessary in the public interest, and the amendment comes into force on 1st September 2005.