Consider the aggregate planning problem for a toy car manufacturing organization whose demand at a plant is as follows:
| Month | September | October | November | December |
|---|
| Demand (in units) | 8000 | 6500 | 10500 | 9500 |
The organization has ONLY the following options available for aggregate planning to meet the demand: (1) in-house production, (2) subcontracting, and (3) inventory holding. Assume that the quantity subcontracted in a given month is available in the same month.
A part of their optimal solution is as follows:
Inventory at the end of October = 1500 units
Units produced in-house in November = 8000 units
Units subcontracted in November = 1000 units
The inventory at the end of November is ______ units (in integer).