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/2011/05/23/test-yourself-math-may-23-2011/

This question is based on the rise in popularity of “internet sweepstakes cafes” in Florida.  How much revenue are these casinos generating every year?