Millions of borrowers can now save big on a mortgage finance as rates have hit the lowest level in more than three years. The average rate on the 30-year fixed mortgage just hit 3.49%, according to a survey by Mortgage News Daily, matching the lowest level since October 2016. That’s down from 3.8% at the start of January and 4.58% a year ago. About 9.4 million borrowers could save an average $272 per month if they were to refinance to a lower rate, according to calculations b