Ins question: $12$ point$($s$)$ possible

The assembly$-$line activities are given as follows for the manufacturing of a product:

$\backslash$table$[[$Task$,\backslash$table$[[$Performance$],[$Time $($mins$)]],$Predecessors,Task,$\backslash$table$[[$Performance$],[$Time $($mins$)]],$Predecessors$],[$A$,6,-,$E$,7,$C$],[$B$,3,$A$,$F$,1,$C$],[$C$,4,$B$,$G$,4,$D$,$ E$,$ F$],[$D$,3,$B$,$H$,2,$G$]]$

For a given $7-$minute cycle time after allowances, the theoretical minimum number of workstations $=5($round your response to the immediate higher whole number$).$

The correct precedence relationship with one of the possible assignment of tasks to workstations for the $7-$minute cycle time is shown in $$

Fig. $1$

The operating efficiency of the assembly line using $5$ workstations $=\%($enter your response as a percentage rounded to two decimal places$).$

$$ Time Remaining: $00$:$21$:$45$