Answer
$\frac{9}{19}$
Work Step by Step
We know that $P(\text{A and B})=P(A)P(B|A)$, thus $P(B|A)=\frac{P(\text{A and B})}{P(A)}=\frac{\frac{18}{100}}{\frac{38}{100}}=\frac{9}{19}$
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