Problem 2. Johnson's plant needs to design an efficient assembly line to make a new product. The assembly line needs to produce 15 units per hour, and there is room for only four workstations. The tasks and the order in which they must be performed are shown in the following table. Tasks cannot be split, and it would be too expensive to duplicate any task. a. Draw the precedence diagram. b. What is the cycle time required to produce 15 units per hour? c. Balance the line so that only four workstations are required. Use whatever rule you feel is appropriate (do not violate the precedence relationship among the tasks). Show your assignment of tasks to each workstation in a table. d. What is the efficiency of the line you just designed