All you self-employed people out there, I’ve got a question

Do you know your costs per item profit? Do you know how valuable your employees are by billable hour? Do you keep tabs on whether or not a certain product or service is worth offering based on a percentage of profit?
I’m curious to find out. What is a good markup? 10%, 20%? How often do you raise rates?
We haven’t raised rates per hour in a long time. Even though our rent, utilities, and health ins has gone up.
I don’t know where to get the information on such statistics.