If you do all business subjects in a Commonwealth supported place (i.e. not international as UWS has no dfee places for accounting) and do all Business subjects (Band 2 subs) it'll cost $7,188 a year and in the end be around $21,000 assuming that the contribution bands don't change/you don't fail/only do business subjects.
However, if you're in a CSP place you can defer the payment so don't think that every year you have to take the 7k out of your own pocket and pay it to the uni. You get, essentially, an interest free loan that you pay back when you start earning over x amount a year (I think it was 33,000ish).
More info can be found here:
http://www.uws.edu.au/students/stuadmin/fees/sc