Potassium (K) has an atomic mass of 39.0983 amu and only two naturally-occurring isotopes. The K-41 isotope (40.9618 amu) has a natural abundance of 6.7302%. What is the mass (in amu) of the other isotope?

A) 12.3622 amu
B) 13.2732 amu
C) 36.3415 amu
D) 38.9638 amu
E) 41.0963 amu