Suppose you want to develop an aggregate operations plan for a product family, whose aggregate demands are given below:

Period Jan Feb Mar

Demand $210220190$

Production

Inventory Level

Beginning

Ending

Assume:

Planning horizon $=3$ months

Initial inventory $=10$ units

Target inventory level of $20$ units at the end of each month $($in chase plan$)$

Target inventory level of $20$ units at the end of planning horizon $($in level plan$)$

Same number of working days in each month