20 articles, 500 words each, $1.50/article

Hello I need 20 articles of 500 words each. As is customary, they must be unique and pass copyscape as well as my own uniqueness-checking tool. All articles must be writen by a native English speaker only and be composed with correct English sentence structure, grammar and punctuation. Please have a sample of your work. I will send you keywords the articles will need to be based on once your bid is accepted. Thanks