Given that:

$$ Total\quad positives\quad of\quad Sam77=600 $$

$$ Negatives\quad of\quad Y_q77=10 $$

Then:

$$ P=\frac{Y_q77}{Positives\quad of\quad Sam} $$

$$ P=\frac{10}{600} $$

$$ P=0.0166666\approx 0.017 $$