A company subcontracts the production of one of the items it markets. The requirement for the next 12 months for this item is: 6, 12, 4, 8, 15, 25, 20, 5, 10, 20, 5, 12. Determine the supply plan using the Silver-Meal method if the company currently has a stock in hand of 4 units and wishes to keep a stock of 8 units at the end of the planning. The capital cost of inventory is $ 1 / unit / month and the order cost is $ 40.