keeping in mind that there are 12 months in a year, thus 18 months is really 18/12 years.
[tex] \bf ~~~~~~ \textit{Simple Interest Earned Amount}
\\\\
A=P(1+rt)\qquad
\begin{cases}
A=\textit{accumulated amount}\\
P=\textit{original amount deposited}\to& \$950\\
r=rate\to 2\%\to \frac{2}{100}\to &0.02\\
t=years\to \frac{18}{12}\to &\frac{3}{2}
\end{cases}
\\\\\\
A=950\left(1+0.02\cdot \frac{3}{2} \right)\implies A=950(1.03)\implies A=978.5 [/tex]