3. A firm is planning the production plan and workforce in the next six months. The demand is 1600, 3000, 3200, 3800, 2200, 2200. Based on the parameters below, formulate an aggregate planning problem and solve it with CVX. (4 pts) Material cost Inventory holding cost Marginal cost of stockout/backlog Hiring and training costs $10/unit $2/unit/month 85/unit/month $300/worker Layoff cost $500/worker Labor hours required 4/unit Regular time cost $4/hour Overtime cost $6/hour Cost of subcontracting $30/unit