Depends if you’re talking about time cost or money.
If you were doing the writing it depends on what your hourly rate is.
create a table of writing costs per word count or maybe by region or experience
what about ai writing?
really think about the purpose of your blog post who will be reading it and where you will be publishing it
the level of quality you will need
will you need images
what’s the turnaround time that you need?
and the platform where you meet with and engage with your writer if you are outsourcing has a fee and process involved.