Q$3$ Using the information in Table $2$

$(9$ marks$)$

$\backslash$begin$\{$tabular$\}\{|$l$|$l$|$l$|$r$|\}$

$\backslash$hline Activity & $\backslash$multicolumn$\{1\}\{|$c$|\}\{$ Description $\}$ & Predecessor$($s$)$ & Duration $($days$)\backslash \backslash$

$\backslash$hline A & Site preparation & None & $4\backslash \backslash$

$\backslash$hline B & Lay foundation & A & $3\backslash \backslash$

$\backslash$hline C & Build walls & B & $5\backslash \backslash$

$\backslash$hline D & Install plumbing & B & $4\backslash \backslash$

$\backslash$hline E & Electrical wiring & C$,$ D & $2\backslash \backslash$

$\backslash$hline F & Painting & C & $3\backslash \backslash$

$\backslash$hline G & Install fixtures & E$,$ F & $3\backslash \backslash$

$\backslash$hline H & Final inspection & G & $1\backslash \backslash$

$\backslash$hline

$\backslash$end$\{$tabular$\}$

a$)$ Draw A Gantt Chart for the project

$(6$ marks$)$

b$)$ If "Install plumbing" is delayed by $2$ days, how does this affect the project duration?

$(3$ marks$)$