Quality Score and CPC (planning estimate)
Uses a rough rule of thumb: about 16% CPC change per Quality Score point. Google does not publish a fixed formula. Use this to size the problem for a budget talk, not as a promise from Google.
Higher Quality Score usually lowers what you pay for the same click. Fix the page, then re-check the auction.
Use this to size the problem, then fix the page. Faster, clearer landings are usually where the discount starts.

