[tex]\bf \qquad \qquad \textit{Future Value of an ordinary annuity}
\\\\
A=pymnt\left[ \cfrac{\left( 1+\frac{r}{n} \right)^{nt}-1}{\frac{r}{n}} \right]
\\\\\\
\qquad
\begin{cases}
A=
\begin{array}{llll}
\textit{accumulated amount}\\
\end{array}\\
pymnt=\textit{periodic payments}\to &600\\
r=rate\to 8\%\to \frac{8}{100}\to &0.08\\
n=
\begin{array}{llll}
\textit{times it compounds per year}\\
\textit{monthly, thus}
\end{array}\to &12\\
t=years\to &30
\end{cases}[/tex]
[tex]\bf A=600\left[ \cfrac{\left( 1+\frac{0.08}{12} \right)^{12\cdot 30}-1}{\frac{0.08}{12}} \right][/tex]
I'm thinking he may make more money turning water into booze though, for 30years, I could be mistaken, who knows