percent annual rate, what would be the new monthly payment assuming a
27-year amortization schedule?
e. What is the difference in the old 6 percent monthly payment and the new
4.5 percent payment?
f. What will be the remaining mortgage balance on the new 4.5 percent loan
at the end of year 7 (four years after refinancing)?
g. What will be the difference in the remaining mortgage balances at the end
of year 7 (four years after refinancing)?
h. At the end of year 3 (beginning of year 4), what will be the present value
of the difference in monthly payments in years 4-7, discounting at an
annual rate of 4.5 percent?
i. At the end of year 3 (beginning of year 4), what will be the present value
of the difference in loan balances at the end of year 7, discounting at an
annual rate of 4.5 percent?
j. At the end of year 3 (beginning of year 4), what will be the total present
value of lost payments in years 4-7 from the lender’s perspective?
k. If the mortgage contains a yield maintenance agreement that requires the
borrower to pay a lump sum prepayment penalty at the end of year 3 equal
to the present value of the borrower’s lost payments in years 4-7, what
should that lump sum penalty be?
Solution:
a. Based on a 30-year amortization schedule, the monthly payment is
b. The balance of the loan at the end of year 7 is $448,197 (solving for the
c. The balance of the loan at the end of year 3 is $480,420 (solving for the
d. The new monthly payment assuming a 27-year amortization schedule is
e. The new loan payment on the new 4.5 percent loan is $433.65 less than
f. The remaining mortgage balance on the new 4.5 percent loan at the end of
g. The difference in the remaining mortgage balances at the end of year 7
(four years after refinancing) is as follows: The balance at year seven for
h. At the end of year 3 (beginning of year 4), the present value of the
differences in monthly payments in years 4-7, discounting at an annual