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: Using longest task (operating) time heuristic, group the assembly-line activities into appropriate workstations. Complete the following table. The actual efficiency of the balance is % (enter your response rounded to one decimal place)