If you want someone who will take a general idea of what the article is about and then just spew out whatever he/she is thinking on the fly, then that will be about 1-2c/word.
If you want someone who will do thorough research on your topic, cite sources correctly in MLA/APA format, use correct spelling, grammar, punctuation, etc, as well as being fluent in English, then that will cost a few cents more per word. If it's adult, though, it probably won't need that much work.
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