Property and Population, page-75

From the Abs website, The Full-Time Adult Average Weekly Total Earnings in November 2014 were $1,539.40, a rise of 2.7% from the same time last year. This does not include super. A total of $80,048.

After tax this equals $5205 a month, fell free to click this link for proof. http://www.icalculator.info/australia/salary_illustration/80000.html

Also we are talking about average house on average wage as you keep referring to, the "median". So don't try and distort the figures.