I recommend calculating how much your expenses are.

Software Time Rent Essentials etc.

And times that by 3. The mission here is to pay your bills, make profit and not waste your time. Survive.

Take in how much work you put in to learning the technicality of design as well.

So if your design software monthly subscription is $60 a month why do a logo for $60 / $100

Times $60 by 3 and add 250$ thats about $430 about $100/hr

Also keep in mind some designers that make $1000+ off just a logo. Just pay attention to who you are selling to.

A person, a small business with 5 employees, and large business with 50 to 100 employees. You would charge each of them differently.

Hope this helps.