keeping in mind that 5 months is not even a year, since there are 12 months in a year, then is really just 5/12 of a year, therefore
[tex]\bf ~~~~~~ \textit{Simple Interest Earned Amount}\\\\
A=P(1+rt)\qquad
\begin{cases}
A=\textit{accumulated amount}\\
P=\textit{original amount deposited}\to& \$6600\\
r=rate\to 4\%\to \frac{4}{100}\to &0.04\\
t=years\to &\frac{5}{12}
\end{cases}
\\\\\\
A=6600\left( 1+0.04\cdot \frac{5}{12} \right)\implies A=6600\left( 1+\frac{1}{60} \right)\\\\\\ A=6600\left( \frac{61}{60} \right)[/tex]
