Five years ago you took out a 30 year mortgage with an APR of 6.20% for $206000. If you were to refinance the mortgage today for 20 years at an APR…

Five years ago you took out a 30 year mortgage with an APR of 6.20% for $206000. If you were to refinance the mortgage today for 20 years at an APR of 3.95%, how much Ould you save in total interest expense?