How much should I expect to pay for school fees in Melbourne if I am a non-resident?

Hi, Does anyone knows what is the public school fees is for non-resident in Australia, and I do not hold a class 457 visa. My daughter will be going into Year 11 this year. The website:http://www.study.vic.gov.au/ shows that the international fee at AU$15K plus for Year 11 and 12, but I found on some school's website that says international student pays alot more than the 15K shown on the Vic's website. Can someone enlighten me on this fee thingy? Thanks. Maurice