Originally Posted by Tokyoite

You dont need the M&B site to find out how much taxes are needed. Use Matrix - ITA Software by Google, select one way, departure and arrivals, and also select your airline (C: NH+, or C: TG+, or C: SQ+, or C: BR+, or C: OZ+ etc), select sales city as Athens, and select currency as Euro.
The results should show you a business class fare, and the breakdown shows the fuel surcharges and taxes (YQ, YR, taxes etc.)