An experiment measures quantities $x, y, z$ and then $t$ is calculated from the data as $t=\frac{x y^{2}}{z^{3}}$. If percentage errors in $x , y$ and $z$ are respectively $1 \%, 3 \%, 2 \%$, then percentage error in $t$ is :
(1) $10 \%$
(2) $4 \%$
(3) $7 \%$
(4) $13 \%$