Suppose you want to develop an aggregate operations plan for a product family by using the level strategy with a target inventory level of $20$ units at the end of planning horizon. The aggregate demands for the product family are given below:

Period Jan Feb Mar

Demand $210220190$

Production

Inventory Level

Beginning

Ending

Assume:

Planning horizon $=3$ months

Initial inventory $=10$ units

Same number of working days in each month