Hi there,
I am an extremely experienced freelancer with over 15 years worth of knowledge in a variety of subjects.
All my work is 100% guaranteed original, and Copyscape proof. My bid is for 10 articles at $10 per article, and though this may be higher than the rest, I think you'll agree quality is better than quantity.
To this end, I would advise that 5-10% SEO keywording is too dense for an article of only 500 words in length - this could come across as too "spammy" in the search engines and be rejected, which you obviously don't want.
Should you choose my bid, I can help advise even further on the best type of approach for maximum SEO.
Best,
Danny.