help pls :)

Your rich Uncle Bertie invested $9,118 on your behalf 10 years ago into a hedge fund. You just found out that your share of that hedge fund is now worth $39,478. What was the average annual return on that hedge fund over the last 10 years? (Please respond with two decimal points - known as the 100 basis point - precision, for instance 19.02 for 19.02% )