I used to charge different rates for different things, but then I realized my time is what's valuable, not so much the task I'm doing. So I switched to $200/hr and stopped wasting time and energy figuring out whether I should be clocked in for this rate, or "that task really falls under that category", or classifying tasks/justifying rates. It's all so much more simple and the client really doesn't care either way I've come to find.

Also, I am based in the SF Bay Area and most of my freelance clients are in California for reference.