Help! Are these profit margins good, bad, or acceptable for investors?

I have leads on a approximately 25 homes that accordding to the calculations after considering purchase price, repairs or updating cost, holding cost, and selling costs, a net profit margin of 14 - 18 percent and some even up to 22 percent is projected. (I feel confident that my numbers are accruate). The homes selling prices range between the 150k and 200k.
How do these margins rank, from an invetor’s position? What are the minimum margins to expect? What should someone expect to spend on repairs in this price range? All opinions are most difinetely welcome. Thanks in advance for your help!