Answer
$\$672.97$
Work Step by Step
Recall:
Compound Interest Formula
The future value $A$ of an investmet $P$ after $x$ years earning $r$ percent year annually is given by the formula:
$$A=P(1+r)^x$$
Thus, the value of an investment of $\$600$ that earns $3.9\%$ interest per year for $3$ years willl be:
\begin{align*}
A& = 600\left(1+3.9\%\right)^3\\
A& = 600\left(1+0.039\right)^3\\
A& = 600\left(1.039\right)^3\\
A &\approx 672.97
\end{align*}
