Over the 12 month period shown, production levels varied between 550 and 700 units per month while average monthly sales were 300 units. The cycle time for production was 8 weeks on average with a minimum of 4 weeks and a maximum of 1.5 weeks for safety stock replenishment. Inventory levels fluctuated between meeting maximum monthly sales of 700 units and the minimum re-order point of 350-400 units plus the 150 unit safety stock level.