Set of 300 words articles

From time to time I have 300 words articles that I need written on variety of topics. Usually they are in sets of 10, so the writer will need to write 10 articles of 300 words for a single project. Usually 2 or 3 sets of articles will come per week. - The articles have to be original as they will be checked with copyscape. - The articles have to be written with a clear English. - Punctuation and grammar rules need to be observed. - Must be able to complete 5 articles of 300 words per day. The writer should stick to this schedule for 2-3 sets per week. - The given keywords have to be highlighted within the article. - Same quality need to be maintained for each article. The budget per article is $1.25. If the writer is successful with submissions for several weeks, then per article fee can be raised. Hence each set will be $12.5.