According to guidelines...............a business, at the end of the day, is only worth, what someone is prepared to pay for it.
Formula goes from 2 x net profit, to as high as 10 x net profit.
Depends on many factors, one of the most overlooked, being, the true value of the outgoing principal / principals, which can have a major bearing on the ongoing value of the business.
Best of luck with your sale
robbie