You have been living in the house you bought 10 years ago for $500,000. At that time, you took out a loan for 80% of the house at a fixed rate 30-year loan at an annual stated rate of 6%. You have just paid off the 120th monthly payment. Interest rates have meanwhile dropped steadily to 5.50% per year, and you think it is finally time to refinance the remaining balance. But there is a catch. The total fee to refinance your loan is $15,000, when you include all the various costs of refinancing. Should you refinance the remaining balance for the remaining 20 years? How much would you save/lose if you decided to refinance?