Rachael has a 100,000, 30 year, fixed mortgage with a 12% nominal interest rate convertible monthly.

She has made payments at the end of each month for ten years.

Now she will begin making twice the payment each month.

How many years will she be able to take off the original 30 years assuming a balloon payment for the final fractional payment?

A. 12

B. 13

C. 14

D. 15

E. 16