A bottling plant fills 2,400 bottles every two hours. the lead time is 40 minutes and a container accommodates 120 bottles. the safety stock is 10 percent of expected demand. how many kanban cards are

A bottling plant fills 2,400 bottles every two hours. the lead time is 40 minutes and a container accommodates 120 bottles. the safety stock is 10 percent of expected demand. how many kanban cards are needed? (round up your answer to the next whole number.)