78 Consolidated  Notes to the  Financial  Statements Note 3 – Segment information (continued) Geographical information The consolidated entity operates in one principal geographical area – Australia. The total of non-current assets other than financial instruments, deferred tax assets and defined benefit assets located in Australia is  $6,910.5 million (2010: $6,375.9 million), and the total of non-current assets located in other countries is $3.1 million (2010: $nil). The total external revenue is all from customers located in Australia for both 2011 and 2010. No single customer amounts to 10% or more of the consolidated entity’s total external revenue for both 2011 and 2010. Information about major customers 2011 2010 $m $m Note 4 – Revenue Revenue from sale of goods  6,898.7 6,466.0 Revenue from rendering of services  173.1 143.9 Other revenue  Royalties  0.7 0.8 7,072.5 6,610.7 Note 5 – Other income Gain on disposal of subsidiaries  – 5.8 Net foreign exchange gains  – 0.6 – 6.4 Note 6 – Expenses Cost of sales  5,706.4 5,327.9 (Gain)/loss in fair value of electricity derivatives – economic hedges  (218.8) 177.4 5,487.6 5,505.3 Administrative expenses  148.9 145.8 Employee benefits expense  330.6 318.1 Other expenses Impairment of trade receivables (net of bad debts recovered)  51.0 44.9 Impairment of property, plant and equipment  – 8.4 Impairment of exploration and evaluation assets  – 13.9 Impairment of available-for-sale equity investments  0.2 2.0 Merger and acquisition related costs  17.3 5.1 Redundancy, termination and restructure costs  27.0 11.1 Phoenix change program costs  – 11.7 Net loss on disposal of property, plant and equipment  3.5 2.1 Operating lease rental expenses  20.9 20.2  Other  52.0 48.3 6,139.0 6,136.9