The average atomic mass of silicon is 28.085 amu. the three silicon isotopes have atomic masses of 27.9769 amu, 28.9765 amu and 29.9738 amu respectively. if the relative percentage abundance of the isotope with atomic mass of 27.9769 amu is 92.2297%, what is the percentage abundance of the isotope with atomic mass of 28.9765 amu? write your final answer in three decimal places and do not write the % sign.