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What might be confusing you is that the Audi 80--which rides on the B platform like the modern A4/A5-- was briefly marketed in the US as the Audi Fox. So they were sold side by side, but were not even in the same class, much less one a derivative of the other. For 1980 the 100 became the 5000, and the 80/Fox became the 4000.
Yes, I think you are correct....a typo on my part.
