A radio isotope X with a half-life 1.4 x...

A radio isotope `X` with a half-life `1.4 xx 10^9` years decays of `Y` which is stable. A sample of the rock from a cave was found to contain `X` and `Y` in the ratio `1 : 7`. The age of the rock is.

`1.96 xx 10^9` years

`3.92 xx 10^9` years

`4.20 xx 10^9` years

`8.40 xx 10^9` years

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