Consider a manufacturing process depicted by the following flowchart. A1 C1 A2 B C2 A3 Station A has 3 parallel operators, A1, A2, and A3. Station C has 2 parallel operators, C1 and C2. Each unit only needs to be processed by one of the operators A1, A2 and A3. After being processed at Station B, a unit then needs to be processed by either C1 or C2. The process time of the individual operators are given as follows. A1, A2, and A3: 21 minutes B: 14 minutes C1 and C2: 6 minutes. The process initiates the production of a new unit every 21 minutes. What is the utilization of Station B in percentage?