I did the same earlier at $20 an hour but decided not to post it....then I found this
Australia's minimum wage is $15.96 per hour x 60 hours a week x 48 weeks of the year (assumed 4 week unpaid holidays) = $46,000 x 2 people = $92,000
($100,000 if holidays are paid)
Even after Super, Medi and Tax you have still got to be looking at a take home pay of $3,000 each
If you are working for a company that is only paying you for 35-40 hours a week and expecting you to work 20+ hours a week for free then its you own fault; a)for doing it & b)for not changing jobs