A fixed-rate mortgage loan has an original balance of $300,000, an annual interest rate of 4.5%, and a term of 20 years. Assume this mortgage requires annual payment, as opposed to monthly. Suppose right after the 3rd year payment, all rates in the economy fall by 1.5%. What is the difference between the present value of the mortgage at the end of the 3rd year if the home-owner chooses not to refinance and the present value if the homeowner chooses to refinance? More clearly, compute PV(keep old mortgage) - PV(refinance mortgage) at the end year 3, or the beginning of year 4. Round your answer to 2 decimal places. If your answer is negative, then include the negative sign in front.