Problem 6-21 (Algo) Consider the following tasks, times, and predecessors for an assembly of set-top cable converter boxes: TASK ELEMENT TIME (MINUTES) PRECEDING TASKS A B C 7 - 7 A 8 B 7 B 9 C, D 7 A 7 8 7 F G E, H I Given a cycle time of 22 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 22-minute cycle time? Note: Enter your answer as a percentage rounded to 2 decimal places. Efficiency %