Silicon has three stable isotopes: silicon-28, silicon-29, and silicon-30. Silicon-29 has an atomic mass and percent abundance of 28.9765 amu and 4.70%, respectively. Silicon-28 and silicon-30 have atomic masses of 27.9769 amu and 29.9738 amu, respectively. What are the percent abundances of silicon-28 and silicon-30, given that silicon's relative atomic mass is 28.0855 amu?
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