Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of $10$ and the second has a voltage gain of 20. If the input signal is $0.01\;V$ calculate the output a.c signal
$\begin{array}{1 1} 2\;V \\ 4\;V \\ 6\;V \\ 1\;V \end{array}$