notes to the financial statements for the year ended 30 June 2001 2001 2000 22. EARNINGS PER UNIT  Net tangible asset backing per unit $3.43  $3.28  Basic earnings per unit  14.4 cents  8.8 cents  Diluted earnings per unit  14.4 cents  8.8 cents Weighted average number of units used in calculating basic earnings per unit  510,000,000  486,191,781 Weighted average number of units and potential units used (as denominator)  in calculating diluted earnings per unit  510,476,438  486,191,781 Information concerning the classification of units (a) Stapled Securities (b) Options Stapled Securities, and therefore units, are fully paid and have been recognised in the determination of basic earnings per unit. Options granted to executives of Transurban City Link Limited under the Transurban Executive Option Plan are considered to be potential Stapled Securities and have been included in the calculation of diluted earnings per Unit.  22