Ad rank plays a vital role in deciding the real cost-per-click that the competitors of any business pay when somebody clicks on their ads.

CPC charged by Google= TheAdrankofthepersonbelowourad/Ourqualityscore  + 0.01$

The cost-per-click we get charged by the Google when somebody clicks on our ad has to do a lot with what some other people were inclined to pay for the click and their Quality Score, divided by our Quality Score, plus 0.01$

BY Best Interview Question ON 11 Apr 2019