## Physics: Principles with Applications (7th Edition)

$99.99997 \%$ accurate.
Calculate the percentage deviation from 100 percent perfection. $$\frac{8 s}{3.156 \times 10^{7}s} \times 100 \%=3 \times 10^{-5} \%$$ One could say the watch is $99.99997 \%$ accurate.