Right, I was thinking USD so ~13€. For that you have a nice main, wine, and coffee in half the ethnic places of Berlin. Not in Mitte as you said though.
As a side note, I don't know anyone actually tipping 10%. At this price range usually it's rounded to next full euro.
If you're in central business locations in Mitte or Charlottenburg it would be more than that. That said you have very cheap options for Turkish, Arab or Vietnamese food in other districts like Neukölln. One of the best benefits I had when self-employed was the cheap & decent "ethnic" food options I had near the coworking space I chose in Neukölln vs having to go to the office in an expensive part of Mitte.