there's another answer on this link.

http://gmatclub.com/forum/science-stude ... 37528.html

but i cannot understand how he get the formula

Please evaluate my essay

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hi alisha18a, as you can see, usually essay questions doesn't get fast response. and the fact that you posted your answer under mine will hide your essay from most view. i suggest that you just create another question with polls like mine and hopefully someone will review your essay. just my 2 cents...

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