The way to maximize accuracy in performing arithmetic is to retain all the accuracy practical and then round off at the end. If you need to convince yourself of that, take a few examples and experiment. You will find if you round off first then add (or whatever) you will often have some inaccuracy.
According to the Pennsylvania state election site, with 99.51% of precincts reporting Clinton has 1,238,351 and Obama has 1,030,805 votes. That's 54.5732% for Clinton 45.4268% for Obama. That is a difference of 9.1464% or 9.146% or 9.15% or 9.1% or 9% depending upon how you want to express it.
If we want to engage in numerology and set a 10% threshold, she didn't make it. She won by 9. I haven't seen this pointed out elsewhere. Wonder if I am in the first 100,000 sites to report it, do I get anything?
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