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Burger Inflation?

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Author: Annie Fetter, Terry Trotter, Steve Risberg, and Steve Weimar
Description: teacher support active problem Algebra, difficulty level 2. Given the affect of inflation, is a national-chain hamburger cheaper or more costly than it was in 1970?
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Problem page: http://mathforum.org/librarypow/puzzles/index2.ehtml?puzzle=2884
Support page: http://mathforum.org/pow/support/algpow/burger.teacher.html
Solution page: Problem #2884

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