Tasks on an assembly line are assigned to $2$ workstations as shown below. If the required cycle time is $100$ seconds, what is the efficiency of the assembly line? $($slide $39)$

Workstation $1$

$\backslash$table$[[$Task$($s$)$ Assigned,Time $($sec$)],[$Task B$,30],[$Task E$,60]]$

Workstation $2$

$\backslash$table$[[$Task$($s$)$ Assigned,Time $($sec$)],[$Task C$,10],[$Task A$,40],[$Task D$,20]]$

$95\%$

$85\%$

$90\%$

$80\%$