\( \Large 0.0005 \times 76 \times 10^{3} + ? = 170\% \  of \   29.98 \)

\( \Large = 0.038 \times 1000 + ? = \frac{30 \times 170}{100} \)

\( \Large ? = 51 - 38 = 13 \approx 12 \)