# Human buying irrationality

I longer watch processors for Socket A on ebay, Athlon XP 1.86GHz with a PR rating of 2500+ costs $7 and Athlon XP 2.16Ghz with a PR rating of 3000+ currently cost $16.

**Calculate:**- About what percentage of the Athlon XP 2.16Ghz is powerful than Athlon XP 1.86GHz
- About what percentage of the Athlon XP 2.16Ghz is more expensive than Athlon XP 1.86GHz
- About what percentage of the Athlon XP 2.16Ghz is powerful than Athlon XP 1.86GHz - based on marketing PR rating

**Result****Leave us a comment of this math problem and its solution (i.e. if it is still somewhat unclear...):**

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