I was asked to create a how-to blog on the topic 'How to stock a healthy pantry' for The Whole Truth Brand. It was purely as part of my project 'SEO blog writing' in my content writing course. 
I used Chatgpt and Google to research on the brand, its personality and its tone of voice. In addition, I devised my outline for the blog and found keywords using Google keyword planner. I used Quillbot and Grammarly for additional grammar and writing suggestions. Finally I used hyperlinks, images and a meta-description to make my blog SEO optimised and eye-catching. 
Since this was a blog I wrote on my own and not for an employer, I didn't charge for it. But for something similar, I would charge close to 80 - 100 ppw.