A company uses a Kanban system. The daily demand for a particular part is 300 units. The average waiting time for a container of part is 0.5 day. The processing time for a container is 0.1 day, and a container holds 10 units. If the company wishes to use a 10% policy variable, how many containers are needed? If the waiting time for a container is reduced in half, then how many containers will be needed?