Math Quiz — NYT Learning Network

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

Test Yourself Math — March 18, 2013

The question deals with massive open online courses (MOOCs) and the online test-proctoring companies that supervise student exams via webcam.  How much could such a company make from a single MOOC?