\(\begin{array}{c|c}
\text{Number of Men} & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\
\hline
\text{Total product(Unit)} & 200 & 440 & 540 & 600 & 640 & 660 & 660 & 640 \\
\hline
\end{array}\)
What is the average product when 3 men are employed?