Need 25 Microsoft Windows Tips Articles

I am looking for some experienced writer, who can write 25 "Microsoft Windows Tips and tricks, How To" articles. The writer should choose the title himself and all the titles should be SEO friendly. The writer should also make sure that the article has proper sub headings and proper keyword density (1.5%). The minimum number of words per article is 500. If the article is a "How To " then the writer should write the article point wise. I have already fixed the price per article and it is $2 per 500 words. Those who bid for this project will need to write a small 200 words paragraph about "Microsoft Windows" and I will choose the writer based on that article. I won't consider any other previous articles the bidders written for previous clients.