Chemistry, 02.04.2021 23:40, sheldonwaid7958

Naturally occurring strontium consists of four isotopes, Sr-84, Sr-86, Sr-87 and Sr-88. Below the data concerning strontium:
Sr-84 83.913 amu ,0.56%
Sr-86 85.909amu ,9.86%
Sr-87 86.909amu ,7.00%
Sr-88 ? ?

Based on the above information and the average atomic mass of Strontium, what is the mass a percent abundance of Strontium-88?

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