Harcourt Manufacturing produces parts for jet engines. It has a lean initiative and is examining several redesigns of one of their operations. Their initial design called for having containers that hold five engine blades. Given demand fluctuations, they are targeting a safety stock of 10%. Lead time that was estimated to be 5 days could be reduced to 1 day, while the daily demand is for 40 blades. 

How many Kanban cards (with rounding) would be required for this design?