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3.1 QUESTION 3 (14 MARKS) (10 MARKS) Decor Ltd has the following figures regarding its inventory: Cost price per unit N$50 per unit Storage cost per unit per year N$5 per unit Weekly demand (usage) 2 000 units Normal delivery time 2.5 weeks Insurance cost per unit per year N$5 per unit Interest rate 9% Ordering cost for 2 orders N$80 Safety stock 5 000 units There are 50 normal working weeks per year, and four weeks in one month. REQUIRED: 3.1.1 Calculate the economic order quantity (EOQ) 3.1.2 Calculate the number of orders per year 3.1.3 Determine the ordering cost per year 3.1.4 Determine the total inventory cost for the year 18/ 27