After three years of the first five-year term at 6.3% compounded semiannually, Dean and Cindy decide to

Question:

After three years of the first five-year term at 6.3% compounded semiannually, Dean and Cindy decide to take advantage of the privilege of increasing the payments on their $200,000 mortgage loan by 10%. The monthly payments were originally calculated for a 30-year amortization.
a. How much will the amortization period be shortened?
b. What will be the principal balance at the end of the five-year term?