At one time during 2001 for every 20 copies of harry potter and the sorcerer's stone that were sold 13.2 copies of harry potter and the prisoner of azkaban were sold express the ratio of copies of the prisoner of azkaban sold two copies of the sorcerer's stone sold as a percent

In order to solve this, you have to take the number of copies of the Prisoner of Azkaban and divide it by the number of copies of the Sorcerer's Stone:
13.2÷20=0.66
To get this into a percentage, multiply the 0.66 by 100, and get 66%, meaning that The Prisoner of Azkaban was sold only 66% as much as The Sorcerer's Stone.

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