33 10 Property, plant and equipment Movements for each class of property, plant and equipment are Computer equipment Furniture and fittings o  ffice equipment Leased office equipment Library collection Total $ $ $ $ $ $ Cost or valuation Balance at 1 July 2006 253,032 159,626 21,533 46,561 531,917 1,012,669 Additions 27,661 485,237 47,319 0 85,825 646,042 Revaluation increase/(decrease) 0 0 0 0 (50,742) (50,742) Disposals 0 (150,966) (13,615) 0 0 (164,581) Balance at 30 June 2007 280,693 493,897 55,237 46,561 567,000 1,443,388 Balance at 1 July 2007 280,693 493,897 55,237 46,561 567,000 1,443,388 Additions 33,495 79,094 10,167 0 89,622 212,378 Disposals 0 0 (250) (46,561) 0 (46,811) Balance at 30 June 2008 314,188 572,991 65,154 0 656,622 1,608,955 a ccumulated depreciation Balance at 1 July 2006 193,059 45,881 10,380 31,047 210,067 490,434 Depreciation expense 35,187 7,128 2,975 11,640 117,348 174,278 Eliminate on revaluation 0 (0) (0) 0 (327,415) (327,415) Elimination on disposal 0 (43,239) (6,812) 0 0 (50,051) Balance at 30 June 2007 228,246 9,770 6,543 42,687 0 287,246 Balance at 1 July 2007 228,246 9,770 6,543 42,687 0 287,246 Depreciation expense 42,317 55,982 12,304 0 124,272 234,875 Eliminate on disposal 0 0 (166) (42,687) 0 (42,853) Balance at 30 June 2008 270,563 65,752 18,681 0 124,272 479,268 Carrying amounts At 1 July 2006 59,974 113,745 11,152 15,514 321,850 522,235 At 30 June and 1 July 2007 52,447 484,127 48,694 3,874 567,000 1,156,142 At 30 June 2008 43,625 507,239 46,473 0 532,350 1,129,687