A manager wants to set up a Kanban system on an assembly process. The demand for the part produced in the target process is 80/units per hr and mean lead time of process is .6 days. The factory operates two 8.5 hour shifts, with 30 minutes of break time per shift. Assuming the safety stock should be set at 10% and container capacity is held at 10% of daily demand, how many Kanban card sets should be authorized?