![mim_feher](https://www.homeone.com.au/img/avatar_h1_25x25.png)
I'm sure it depends on a lot of factors including type of concrete, size, thickness, slope, paths, quality of finish and drainage requirements. We are paying 6.7k for 64sqm of concrete (coloured through) with 2 drains, materials (mesh and sand) on a moderate slope.
This is a bit nasty but gives a ball park figure... http://www.driveways.com.au/?ACDP=403#