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Naturally occurring rubidium is 72.8% of isotope 85Rb and 27.2%

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Naturally occurring rubidium is 72.8% of isotope 85Rb and 27.2% of isotope 87Rb. What is the atomic weight of rubidium?

This is my last homework problem before finishing this assignment for my General Chemistry class. I would greatly appreciate it if the Expert could please "walk me through" this problem.
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