"the key is to educate newer contractors as to the cost of doing business and the difference between being an "employee" of yourself and a business owner."

There is no fixed price to charge, every business will have it's own set of operating expenses, some of the differences may be type of business they are running, all construction , some small construction with service work, all service work and no construction, the overhead will vary for each type of operation, also the type of employees you are trying to attract, better paid employees with benies, will cost more, also do you intend to grow the business, if so, in what way, the best way to overcome all these questions, is to sit down and draw up a business plan, and insert the actual forcasted costs to reach the expected plan.