I need 20 short articles (around 500 words) on a single subject (to be discussed later) to be completed in 1 week. Articles should be well researched and written with perfect grammar and spelling. I reserve the right to demand unlimited revisions. American English writers preferred. Budget is around US$20 per article. I am aware that this is quite expensive, but I need the best writers for this project. Please provide sample along with your bid.