Consider a 30-year fixed-rate mortgage for $100,000 at a nominal rate of 9%. An S&L issues this

Question:

Consider a 30-year fixed-rate mortgage for $100,000 at a nominal rate of 9%. An S&L issues this mortgage on April 1 and retains the mortgage in its portfolio. However, by April 2 mortgage rates have increased to a 9.5% nominal rate. By how much has the value of the mortgage fallen?