The precedence table for all routine tasks performed after work hours for one family is given.

a$)$ Draw the AON network for the after$-$work hours activity and calculate ES and EF for each activity.

b$)$ Draw the Gannt chart for the whole activity based on ES and EF$.$

$\backslash$table$[[$Activity$,$Description,Time $($minutes$),\backslash$table$[[$Immediate$],[$Predecessors$]]],[$a$,\backslash$table$[[$Dad$,$ Mom, and son arrive home in the same$],[$car$]],5,-],[$b$,$Dad and Mom change clothes,$10,$a$],[$c$,$Son watches TV$,25,$a$],[$d$,$Mom warms up the food,$15,$b$],[$e$,$Dad sets the table,$10,$b$],[$f$,$Son does homework,$25,$c$],[$g$,$Mom fixes salad,$10,$d$],[$h$,$The family eats dinner,$40,e,f,g$