Write articles about earnings on the Internet

You need to write articles about earnings on the Internet. You need unique articles with 4-5k characters each.
3 articles like this are needed:
- How to make money online
- Online earning sites
- Referral earnings on the Internet

Uniqueness of articles from 95% and above. Crossing of texts in articles maximum 20%. Articles should not have website names. Articles should be interesting and readable.

I am interested in the total cost of writing these articles.