17.65 would be the answer if m = 9. Perhaps everyone has already noticed that, but I thought I'd throw that out there just in case...
Wouldn't the result then be more like 16.65 ?!!
Anyway, for me the calculation comes up right in Construct as well. So a cap from you UnixRoot would help a lot to figure out what's actually going on.
Greetings from the rainy Germany
Yes, weather gone bad already.