... 9.12 South Carolina Furniture, Inc., produces all types of office furniture. The "Executive Secretary" is a chair that has been designed using ergonomics to provide comfort during long work hours. The chair sells for $130. There are 480 minutes available dur- ing the day, and the average daily demand has been 50 chairs. There are eight tasks: Task Must Follow Task Listed Below Performance Time Task (min) A4 B 7 C 6 AB E F,G a) Draw a precedence diagram of this operation. b) What is the cycle time for this operation? c) What is the theoretical minimum number of workstations? d) Assign tasks to workstations. e) What is the idle time per cycle? f) How much total idle time is present each day? g) What is the overall efficiency of the assembly line? PX