Since C-12 has a mass of 12.0 amu and occurs as 98.9 % abundant; the C-13 has a mass of 13.0amu and occurs as 1.O% abundant, and the C-14 has a mass of 14.0 amu and occurs as 0.1% abundant; Show a numerical set up for the determination of the atomic mass of carbon, then the resulting answer.