Marilyn$$ Hart, operations manager at Hart$$ Electronics, faces$$ assembly$-$line balancing problems. She has been told that the firm needs to complete$1,400$ electronic relays per day. There are $420$ minutes of productive time in each working day$($which is equivalent to$25,200$ seconds$).$ The$$ assembly$-$line activities are given$$ below:

$$

Task

Time$($seconds$)$

Must Follow Task

Task

Time$($seconds$)$

Must Follow Task

A

$13$

$-$

G

$5$

E

B

$4$

A

H

$6$

$$F$,$ G

C

$10$

B

I

$7$

H

D

$10$

$-$

J

$5$

H

E

$6$

D

K

$4$

$$I$,$ J

F

$12$

E

L

$15$

$$C$,$ K

Part $2$

Using longest task$($operating$)$ time$$ heuristic, group the$$ assembly$-$line activities into appropriate workstations. Complete the following table.

Station

Tasks

$1$

$$A$,$

B

$2$

D

$,$ E

$3$

$$F$,$

G

$4$

$$H$,$

C

$5$

$$I$,$ J$,$

K

$6$

L

Part $3$

The actual efficiency of the balance is

$$

enter your response here$\%($enter your response rounded to one decimal$$ place$).$