Answer
$0.3 $ or, $30 \%$
Work Step by Step
Here, we have $P(B|A)=\dfrac{\text{drug A and got better} }{\text{drug A}}$
or, $P(B|A)=\dfrac{0.1}{1/3}$
or, $P(B|A)=0.3 $ or, $30 \%$
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