Adam Smith bought a home with a 13% adjustable rate mortgage for 20 years. He paid $11.72 monthly per thousand on his original loan. At the end of 4 years he owes the bank $75,000. Now that interest rates have gone down to 10%, the bank will renew the mortgage at this rate or Adam can pay $75,000. Adam decides to renew and will pay $9.66 monthly per thousand on this loan. You can ignore the small amount of principal that has been paid.