German wartime international airmail rate

Can anyone please tell me what the 1940 rate would be for an airmail letter,
weighing 3.5 grams, mailed from Germany to Argentina? A cover I have is
franked with one 25m commemorative stamp (Scott #497) and two Hindenburg
definitives of 100m and 50m.

(Since the definitives are on cover, I can't be sure whether they are the
1933 issue or the 1933-36 issue, which was watermarked with a swastika. Not
that this has anything to do with my question, although it would be
interesting to know. The cover was mailed by a Jew from Krefeld in 1940.)

Bob Ingraham

-------
Baby Elizabeth Ann Morgan didn't know it at the time, but her birth
coincided with one of the most significant days in all of history. Read
about her simple birth announcement, and about that historic day, at
http://www.ingraham.ca/bob/DDay.html.
-------