Question 21 1 pts An aggregate plan is being developed for the next three periods using the transportation method of aggregate planning. You start the period with 500 units in inventory. Other necessary information is provided in the table below. You need to schedule for any overtime to be worked before the aggregate planning period begins. How much overtime is to be worked in each of the three periods (1, 2, and 3, respectively) if you follow the lowest cost plan? Initial inventory 500 units Units needed Time Regular Over- Sub- Period time contract Regular time cost $50/unit Overtime cost $60/unit 2000 550 1000 2000 1 Subcontracting 1000 $70/unit 2000 500 2000 2 cost Initial Units needed Time Regular Over-Sub- inventory contract Regular time cost 500 units Period time $50/unit 2000 2000 1000 550 Overtime cost $60/unit Subcontracting 2 2000 2000 500 1000 $70/unit cost $5 Carrying cost 3 3100 2000 500 1000 /unit/period No back ordering is allowed O, O, O O, O, 600 500, 100, 500 O, 100, 500 None of the other answers are correct