3.1 A company manufacturing stainless steel products has orders of 45000 units per year for their pipe fittings. The company operates its production facility 300 days per year, and is able to produce 240 units per day. Setting up for [TURN OVER] EPT1601 production costs the company R120 and the holding cost is R60 per unit per year. 3.1.1 Determine the optimum order quantity. 3.1.2 Determine the average inventory that will be in stock in the company. 3.1.3 Determine the total cost of inventory (set up + holding). (2)