Try $43 billion Kippa5.Here it is straight from the horse's mouth so to speak. From Wilkepedia:
'The National Broadband Network (NBN) is a fibre to the premises (FTTP)[1] network under construction in Australia. The Australian government has established a government business enterprise, NBN Co Limited,[2] to design, build and operate an Open Access Network providing download speeds of up to 1 Gigabit per second[3][4] to 93% of Australian homes and businesses, for which it is offering to contribute an initial cash injection of up to A$43 billion?
Please Note that the announcement only states it is an INITIAL cash injection. Goodness knows what the final price will really be!