Need a writer to write blog posts

I need a writer, to write 20 blog posts for me. Articles can be on any topics It should be error free , with good english and 100% original. Articles should vary from 200-350 words and I pay 0.5$ per article. You should select your topic and get it approved by me. People who are ready to work on this rates and can provide me article on given dates should bid. Please attach a sample , when u bid.