Answer
$C = 1.59 \times 10^{-12} \,\text{F}$
Work Step by Step
The capacitance depends on the area $A$ of the plate and the distance between the two plates and it is given by
$$C = \dfrac{\epsilon_o A}{d}$$
Substitute by the values of $\epsilon_o, A$ and $d$ to get the capacitance $c$
\begin{align*}
C &= \dfrac{\epsilon_o A}{d} = \dfrac{(8.85 \times 10^{-12} \,\text{F/m}) (0.030\,\text{m})^2}{0.05 \,\text{m}} = \boxed{1.59 \times 10^{-12} \,\text{F}}
\end{align*}
