A sample contains \( 10^{-2} \mathrm{~kg} \) each of two substances \( A \) and \( B \) with hal...

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A sample contains \( 10^{-2} \mathrm{~kg} \) each of two substances \( A \) and \( B \) with half lives \( 4 \mathrm{~s} \) and \( 8 \mathrm{~s} \) respectively. The ratio of then atomic weights is \( 1: 2 \). The ratio of the amounts of \( A \) and \( B \) after \( 16 \mathrm{~s} \) is \( \frac{x}{100} \). The value of \( x \) is
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