Carbon has 3 natural occurring isotopes: Carbon-12 has a mass of 12.009 with a percent abundance of 98.85 % Carbon-13 has a mass of 13.003 with a...

Carbon has 3 natural occurring isotopes: Carbon-12 has a mass of 12.009 with a percent abundance of 98.85 %  Carbon-13 has a mass of 13.003 with a percent abundance of 1.07 % , and Carbon-14 has a mass of 0.8 %. Calculate the average atomic mass of Carbon. Please show all your work.