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Element Z consists of 3 isotopes,
Z-28 with a mass of 27.977 amu
Z-29 with a mass of 28.976 amu
Z-30, whose atomic masses is 29.974 amu.
The most abundant isotope is Z-28 which accounts for 92.23% of the atoms.
Given that the observed atomic mass of element Z is 28.0855 amu; calculate the percentages of Z-29 and Z-30 in nature.

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