Meritor hires a team of consultants. The consultants sugge partial robotic automation as well as the safety stock to be percent. Meritor implements these suggestions. The result an increase in efficiency in both the fabrication of muffler assembly and the making of catalytic converters. The muffle assembly fabrication cell averages $20$ assemblies per hour and the lead time is three hours' response time for a batch $10$ catalytic converters. How many kanban cards are neede $($Round up your answer to the next whole number.$)$

Number of kanban card setsL on