40 travel articles a month - $2.5 for 500 words

I'm looking for long term writers to write articles on major European cities. Articles must be written in clear English with good spelling and grammar. Must be unique and pass copyscape. After delivery, the articles cannot be used for any other purpose. Articles must be 500+ words and contain a keyword with the specified density (I will provide the topic and keyword). I will need at least 40 articles a month and will pay $2.5 for 500 words. A test of 3 articles will be required at first to establish trust on both sides. Of course, they will be payed if pass the requirements. Please provide a sample of your work with the bid. Please bid for 40 articles.