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/2011/06/08/test-yourself-math-june-8-2011/

This question is based on rising gas prices and their effects on family budgets and consumer behavior.