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/2011/08/31/test-yourself-math-aug-31-2011/

This question is based on a recent report tying U.S. Census data to consumer spending.  Approximately how much is spent on back-to-school clothing per student?