A sample of silver is analyzed in a mass spectrometer and found to contain only the isotopes 107Ag^{107}\text{Ag}107Ag and 109Ag^{109}\text{Ag}109Ag. The relative atomic mass of the silver in this sample is 108.1.
What is the percentage abundance of the 109Ag^{109}\text{Ag}109Ag isotope in this sample?
35%35\%35%
45%45\%45%
55%55\%55%
65%65\%65%
