Mejza Compressors uses a lean production assembly line to make its compressors. In one assembly area, the demand is 150 parts per 8-hour day. It uses a container that holds eight parts. It typically takes about 6 hours to round-trip a container from the work center to the next and back again. Mejza also desires to hold 15% safety stock of this part in the system. How many containers should Mejza Compressors be using?