Consider the following tasks, times, and predecessors for an assembly of set$-$top cable converter boxes:

TASK ELEMENT TIME $($MINUTES$)$ PRECEDING TASKS

A $8$

B $8$ A

C $9$ B

D $8$ B

E $10$ C$,$ D

F $8$ A

G $8$ F

H $9$ G

I $8$ E$,$ H

Given a cycle time of $25$ minutes, develop two alternative layouts. Use the longest task time rule and the largest number of following tasks as a secondary criterion. What is the highest efficiency of your layout, assuming the $25-$minute cycle time?

Note: Enter your answer as a percentage rounded to $2$ decimal places.