1) For the following monthly demand forecast develop an aggregate plan when a) 55 units per day is produced and unmet demand is backordered. b) 55 units per day is produced and overtime is used when needed. Month Demand Production Days 1 1175 20 2 1600 22 3 1300 21 4 900 21 5 900 19 6 1000 22 item Inventory carrying cost Subcontracting cost per unit Average pay rate Overtime pay rate Labour-hours to produce a unit Cost of increasing daily production rate (hiring and training) Cost of decreasing daily production rate (layoffs) Backorder cost $5 per unit per month $20 per unit $10/hr ($80 per day) $17/hr (above 8 hrs/day) 1.6 hours per unit $300 per unit $600 per unit $10 per unit