A JIT/lean system uses kanban cards to authorize production and movement of materials. In one portion of the system, a work centre uses an average of 108 pieces of a part per hour. The manager has assigned a safety factor of 0.50 . Standard containers are designed to hold seven dozen pieces each. The cycle time for a kanban is 123 minutes. How many kanbans are needed? (Round the final answer to the nearest whole number.) Number of Kanbans Calculate the takt time for a system where the total time per shift is 480 minutes, there is one shift, and workers are given two 15 minute breaks and 55 minutes for lunch. Daily demand is 302 units. (Round the final answer to 2 decimal places.) Takt time minutes per unit