Making measurements and analysing data

The density $\rho\,$ of a uniform metal cylinder can be determined using the equation

\rho = \frac{M}{\pi r^2 L}

where $M\,$ is the mass of the cylinder, $r\,$ is its radius, and $L\,$ is its length.

The percentage uncertainty in $r\,$ is 1.6% and the percentage uncertainty in $L\,$ is 2.5%. The percentage uncertainty in $M\,$ is negligible.

What is the percentage uncertainty in $ρ\rho$ ?

$4.1%4.1\%$

$5.7%5.7\%$

$6.6%6.6\%$

$8.2%8.2\%$