[tex] \bf ~~~~~~ \textit{Compound Interest Earned Amount}
\\\\
A=P\left(1+\frac{r}{n}\right)^{nt}
\quad
\begin{cases}
A=\textit{accumulated amount}\\
P=\textit{original amount deposited}\dotfill &\$800\\
r=rate\to 7\%\to \frac{7}{100}\dotfill &0.07\\
n=
\begin{array}{llll}
\textit{times it compounds per year}\\
\textit{annually, thus once}
\end{array}\dotfill &1\\
t=years\dotfill &4
\end{cases}
\\\\\\
A=800\left(1+\frac{0.07}{1}\right)^{1\cdot 4}\implies A=800(1.07)^4\implies A = 1048.636808 [/tex]
