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

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

A $5$

B $5$ A

C $6$ B

D $5$ B

E $7$ C$,$ D

F $5$ A

G $5$ F

H $6$ G

I $5$ E$,$ H

Given a cycle time of $16$ 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 $16-$minute cycle time?

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