I may be mistaken but, looking at my own revenues, I have always believed that
taxes are added to the total sale price BUT, come out of the sellers 70%. Apple clearly
states the developer/seller is responsible for any applicable taxes. As such, I believe
the 30% is on the set sale price, not the price+applicable taxes/fees. Apple collects the
taxes/fees on say .99 cent app, passes those on to the relevent agencies and then
takes it's 30% of .99 cents. Leaving the seller with .69 cents - whatever the tax was.
So, if the app, with taxes and fees ends up costing the customer $1.25. The seller
would receive .43 cents or so of the sale.
Let's remember, developers get 70% of the sales revenue, not the *****.