Article Writer and Blog Writer

I am looking for a writer to write articles (approx. 500 words) for several websites that we have. The first will be for articles about personal finance, business, economy, and entrepreneurship. The second will be for articles revolving around marketing, business, web design, and social media marketing. Finally articles about wine, food, wine and food pairing. - I am looking to pay $4 per article. - The article MUST be ORIGINAL work. I want a Copyscape report - The article must be grammatically correct and spell checked - The article must come across as being written by a native fluent speaker in a "conversational" manner - The writer doesn't have to be a native speaker but the writing needs to come across like that - The article must be decently researched and provide current and cogent information - The article must be keyword rich and have SEO in mind - The article has to be of the highest quality How many articles can you write in a day that meet these requirements? If the quality is upheld then this can become a long term operation.