Math Quiz:  NYT Learning Network

Through Math for America, I am part of an on-going collaboration with the New York Times Learning Network.  My latest contribution, a Test Yourself quiz-question, can be found here:

http://learning.blogs.nytimes.com/2010/11/01/test-yourself-math-nov-1-2010/

This problem was based on an article about the ever-increasing income inequality in the U.S.