please show work so I can understand this

2.17. For the following data, calculate the number of workers required for level produc- tion and the resulting month-end inventories. Each worker can produce 15 units per day, and the desired ending inventory is 9000 units. Month 1 2 3 4 Total Working Days 20 24 12 19 Forecast Demand 28.000 27,500 28.500 28,500 Planned Production Planned Inventory 11,250 Answer. Workers needed = 98 workers First month's ending inventory = 12,650 units