Davidson-Harley makes scooters. Output rate is 2,000 units per month. Assume one eight hour shift per day, and 20 working days per month. Each scooter has an engine, and each engine has two crankshaft bearings. Manufacturer of this component (bearings) is located nearby, and supplies them in batches of 35 pieces. The supplier is somewhat unreliable, and Davidson-Harley management likes to use a safety factory of 0.3 or 30%. Given this information, determine the number of kanbans required. Show details of your analysis.