susan purchases a home for $180000 and pays a 15% down payment. she finances the remainder with a 25 year mortgage at an interest rate of 5.45% a year compounded monthly.

a. determine her monthly mortgage payment.

b. determine the balance on the mortgage after 5 years.

c. susan renegotiates her mortgage after 5 years. she accepts a 20 year term at an interset rate of 4.99 compounded monthly. determine her new monthly mortgage payment.