This is the question and the answer. please explain in detail the red square and how we got that.

14. An electronics plant is to produce 500 calculators at 85% efficiency by one line. On the basis of the accompanying table, develop the balanced workstation configurations required to meet this production goal. 9 8 10 a b 11 8 d f h 5 12 3 FIGURE 4.17 Task Time (in minutes) Immediate Predecessor task(s) 1 2 || 3 1 4 1.10 0.45 0.38 0.25 2.50 0.50 0.10 0.05 2,3 4 5 6 7 5 5 8 6,7 polutions to Assignment # 1 Prob. 14 Assume 8 hours per day. Hence 8 x 60 minutes per day Efficiency is 85%. Hence # of units to be produced per day 500/0.85 = 588 Cycle Time = 480/588 = 0.816 Hence here is the configuration: Jobs 3 and 4 Jobs 1 and 2 Jobs 5,6,7 & 8 0.55+0.225 0.38+0.25 0.625+0.125+0.025+0.0125 Efficiency = 1-[{[7x0.7875] 5.33}447x0.7875)} = .96689 or 96.68 %