34  Annual Report 11 Intangible assets a  cquired software $ Cost Balance at 1 July 2006 433,413 Additions 18,211 Balance at 30 June 2007 451,624 Balance at 1 July 2007 451,624 Additions 12,571 Balance at 30 June 2008 464,195 a  ccumulated amortisation Balance at 1 July 2006 392,541 Amortisation expense 23,314 Balance at 30 June 2007 415,855 Balance at 1 July 2007 415,855 Amortisation expense 28,909 Balance at 30 June 2008 444,764 Carrying amounts At 1 July 06 40,872 At 30 June and 1 July 2007 35,769 At 30 June 2008 19,431