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:

https://learning.blogs.nytimes.com/2011/08/29/test-yourself-math-aug-29-2011/

This problem is based on the government bailout of General Motors.  How much would the U.S. government lose if they sold all their G.M. stock right now?