A borrower has secured a 30 year, $251,000 loan at 8% with monthly payments. Fifteen years later, the borrower has the opportunity to refinance with a fifteen year mortgage at 7.5%. However, the new loan requiers the borrower to pay 2 points at closing. What is the return on investment if the borrower expects to remain in the home for the next fifteen years?

Please input your answer as an annual interest rate (i.e. 8.32% would be input as 8.32).