[Tex/LaTex] Making thick horizontal lines and a thick vertical line in a table

Question

I have the code for a table. What is the default thickness for the lines? I would like to double the thickness for the vertical line to distinguish the "total column", and I would like to double the thickness for the horizontal line to distinguish the "total row." (I guess that I should make the line separating the title thicker, too.)

\documentclass{amsart}

\begin{document}
\noindent \hspace*{\fill}
\begin{tabular}{|| c | c | c | c ||} \hline
\multicolumn{4}{|| c ||}{{\bf Residents of Preston City}} \\ \hline
        &   Employed    &   Unemployed  &   Total \\ \hline
Men     &   27,000      &               &          \\ \hline
Women   &               &               &   21,500 \\ \hline
Total   &   48,000      &               &   50,500 \\ \hline
\end{tabular}
\hspace{\fill} 

\end{document}

Answer 1

You can use makecell, which has \Xhline{thickness} and \Xcline{thickness}{col1-col2} commands.

Alternatively, the boldline package, from the shipunov bundle, has \hlineBand \clineB commands; the argument is num times \arrayrulewidth. It also has a V{num} specifier for vertical rules, which replaces |.

By the way, the default \arrayrulewidth is 0.4pt.

Demo of both solutions:

\documentclass{amsart}
\usepackage{makecell}
\usepackage{boldline}
\setcellgapes{3pt}

\begin{document}
\noindent \hspace*{\fill}
\begin{center}
  \makegapedcells
  \begin{tabular}{|| c | c | c !{\vrule width0.8pt}c ||}
    \hline
    \multicolumn{4}{|| c ||}{{\bf Residents of Preston City}} \\
    \hline
          & Employed & Unemployed & Total \\
    \hline
    Men & 27,000 & & \\
    \hline
    Women & & & 21,500 \\
    \Xhline{0.8pt}
    Total & 48,000 & & 50,500 \\
    \hline
  \end{tabular}

  \vskip3ex
  \begin{tabular}{|| c | c | c V{2}c ||}
    \hline
    \multicolumn{4}{|| c ||}{{\bf Residents of Preston City}} \\
    \hline
          & Employed & Unemployed & Total \\
    \hline
    Men & 27,000 & & \\
    \hline
    Women & & & 21,500 \\
    \hlineB{2}
    Total & 48,000 & & 50,500 \\
    \hline
  \end{tabular}
\end{center}

\end{document}