I have been (re)writing and editing articles, dissertations and the like for over 18 years for e.g. students and researchers, so I am able to write (and research if necessary) about almost any topic.
I have no knowledge about the number of articles needed, but to give you an example: I write one page (A4) articles for USD 2.50 and half page (A4) articles for USD 1.50 on average. Please note that prices are of course just indicative. I work fulltime from home, so I should have no trouble meeting deadlines concerning bulk assignments or deadlines.