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the basis of these basic costs can hardly be questioned
Explanation: I read Ansatz to mean the basis of. It sounds pretty bad to then follow with basic costs but that's the meaning. You might want to find another term (from your context) for Grundkosten. Problematisieren is to question, to place doubt on something.
Harper Collins Unabridged Dictionary
Kim Metzger Mexico Local time: 02:39 Native speaker of: English PRO pts in pair: 21848