(8 marks) Question four Using the following data, we will show the formulation in a transportation format and the final 1 2 3 4 5 6 7 8 9 Total solution. Periods Expected Demand (units) Output rate in regural time 800 600 1000 700 800 960 800 700 600 6960 650 650 650 650 650 650 650 650 650 5850 * Hiring * Costs of output: * Regular time = 2 Jd. Per unit * Overtime = 3 Jd. Per unit * Subcontracting = 5 Jd. Per unit * Inventory = 1 Jd. Per unit * Back orders = 6 Jd. Per unit/period = 4 Jd per unit Firing = 1.5 Jd per unit Allawable quantities of decision variable as a follow: - Overtime = 70 units/period - Subcontracting = 50 units/period - Hiring = 40 units Inventory between periods is allowed, but the Beganing and ending invetory equal zero. Back orders = allowed in any quantity. Required: 1- Prepare the aggregate plan for nine periods. 2- Determine the total cost of the plan including production, inventory, and back orders. =