Five Years Ago You Took Out a 30-Year Mortgage with a Quoted

Five years ago you took out a 30-year mortgage with a quoted APR of 6.5% for $200,000.If you were to refinance the mortgage today for 20 years at a quoted APR of 4.25%,how much would you save in total interest expense?

A) $176,846
B) $75,848
C) $151,696
D) $98,770
E) $108,340