there are 12 months in a year, so in 33 months, there are 33/12 years then.
[tex]\bf \qquad \textit{Simple Interest Earned}\\\\
I = Prt\qquad
\begin{cases}
I=\textit{interest earned}\\
P=\textit{original amount deposited}\to& \$200\\
r=rate\to 13\%\to \frac{13}{100}\to &0.13\\
t=years\to &\frac{33}{12}
\end{cases}
\\\\\\
I=200\cdot 0.13\cdot \cfrac{33}{12}[/tex]
