Answer
$$ \$3296.8$$
Work Step by Step
W are given$$ R(t)=800,\ \ \ \ \ T=5, \ \ \ \ \ r=0.08$$
Then
\begin{align*}
P V&=\int_{0}^{T} R(t) e^{-r t} d t\\
&= \int_{0}^{5} 800 e^{-0.08 t} d t\\
&=\left.\frac{800}{-0.08} e^{-0.08 t}\right|_{0} ^{5}\\
&=-10000\left(e^{-0.4}-e^{0}\right)\\
& \approx \$3296.8
\end{align*}
