The density $\rho$ of a uniform cylinder is determined by measuring its mass $m$, length I and diameter $d$. The measured values of $\mathrm{m}, \mathrm{l}$ and d are $97.42 \pm 0.02 \mathrm{~g}, 8.35 \pm 0.05 \mathrm{~mm}$ and $20.20 \pm 0.02 \mathrm{~mm}$, respectively. Calculated percentage fractional error in $\rho$ is $\_\_\_\_$。