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 210 220 190 Production Inventory Level Beginning Ending Assume: Planning horizon = 3 months Initial inventory = 10 units Same number of working days in each month (a) What should be the monthly production quantity? units (b) In the level plan, what will be the inventory level at the end of Jan? units