Stanford Rosenberg Computing wants to establish an assembly line for producing a new product, the Personal Digital Assistant (PDA). The tasks, task times, and immediate predecessors for the tasks are as follows: Task Immediate Predecessor B D E Time (sec) 12 15 8 5 20 A A B, C D Rosenberg's goal is to produce 180 PDAs per hour. a) The cycle time for the production of a PDA = 20 seconds (round your response to two decimal places). b) The theoretical minimum number of workstations that Rosenberg can achieve in this assembly line = (round your response up to the next whole number)