GGB It varies with your structure (mainland through the Dubai Department of Economy and Tourism (DET, formerly DED) versus a free-zone authority), your activities and your location, so any single figure quoted online is indicative at best. Treat the licence as one line in a much larger opening budget, and confirm the current fee schedule directly with the relevant authority for your case rather than relying on a number from an article.
From Dubai Restaurant Licence Cost: Every Fee, Explained — the full reading, with the method behind this answer.