PQR Machining is implementing a pull system using Kanban as part of an effort to implement a lean approach to operations. Planned usage of a particular part at one of its workstations is $200$ parts per hour and a standard container has a capacity of $50$ parts. The company operates one shift of $8$ hours per day, and it takes $30$ minutes for an empty container to be replenished and produced. In addition, management has determined that the workstation has an inefficiency factor of $10\%.$ Calculate the number of cards$/$containers needed for the Kanban pull system for this work center