The MathCast below is a more sophisticated % problem which requires processing several pieces of data expressed in percent form. Students have to make sense of the information and develop a model to represent the data. Both a tree model and a table/spreadsheet approach are demonstrated.
These are the kinds of data-based applications which will become a central theme of the newer assessments from PARCC, SBAC and the College Board.
Sorry, you'll have to watch the video to see the problem but I'll give you a glimpse:
70% of the left-handed students surveyed were boys...
Watch "SAT/Common Core Data-based Percent Challenge" on YouTube - SAT/Common Core Data-based Percent Challenge: http://youtu.be/mhQN8imj-Pg
Also, pls let me know if these MathCasts are blurry.