Explain what is the age of the rock

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Question- Rubidium-87, 87Rb, decays by beta emission to strontium-87, 87Sr. The ratio of strontium-87 to rubidium-87 was 0.2218. Assuming no strontium was originally in the rock, what is the age of the rock? The half-life of rubidium-87 is 4.800e+10 yr.

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