need answer by using BA II plus financial calculator .please describe the steps clearly

2. The Taylors agreed to monthly payments rounded up to the nearest $100.00 on a mortgage of $136 000.00 amortized over 15 years. Interest for the first five years was 8.5% compounded semi annually. After 30 months, as permitted by the mortgage agreement, the Taylors increased the rounded monthly payment by 10%. Determine the mortgage balance at the end of the five-year term