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/2011/05/4/test-yourself-math-may-4-2011/

This question is based on a recent article about the dwindling consumer support for “Green” products.  Just how much does it cost us to “Go Green”?