Blog Data Entry - Wordpress

I am looking for someone to take existing web pages and enter them into Wordpress as either a blog post or page. This will involve stripping out any old style tags, and coding so the new entries are nice clean text. Also the new entries will need to be styled using new header conventions (pretty straightforward apply h2, h3, h4 etc) The initial project will be 20 posts. However we have over 400 posts that need to be transferred and if satisfied, will be looking to outsource the balance of the pages. Please estimate the project based on 20 pages under the assumption that you would could continue to make entries for the remainder of the posts at that same cost per 20 pages. Note the majority of these pages are really simple text pages, most without pictures etc.