\textbf{55 --} The length of a simple pendulum is changed to $17\,\text{cm}$, and its period increases by $12.5\%$. What was the period (before the change) in seconds? $\left(g = \dfrac{\pi^2\,\text{m}}{\text{s}^2}\right)$
\begin{itemize}
\item[(1)] $1.2$
\item[(2)] $1.4$
\item[(3)] $1.6$
\item[(4)] $1.8$
\end{itemize}