The Zhao Family Purchased a $670,000 Home 7 Years Ago

The Zhao family purchased a $670,000 home 7 years ago. The mortgage was based on 25-year amortization and the term of the mortgage was for 7 years at 6.3% interest compounded semi-annually. At the start of year 8, the Zhao family have refinanced their mortgage at 6.1% compounded semi-annually, and have decided to increase their payments by 10% of the original payment amount. Determine how much faster the family will be able to pay off the mortgage by increasing payments and lowered interest rates.

A) 33 months faster
B) 35 months faster
C) 37 months faster
D) 39 months faster
E) 41 months faster