Frank and Vanessa purchase a home with a $200 000 mortgage amortized over 20 years. They decide on a five year mortgage term at an interest rate of 4.87 percent. During their first mortgage term, interest rates rise sharply. When it comes time to renew their mortgage at the end of the five-year term, they decide on a three-year term at an interest rate of 6.39 percent, compounded semi-annually.

a. What is their outstanding mortgage balance at the end of the original five-year term? 

b. What will be the impact on how long it will take the couple to pay off their mortgage if they do not change their monthly mortgage payment and interest rates remain at the three-year mortgage term interest rate?