BASIC EOQ Model:The objective of this model is to MINIMIZE total annual cost by means of controlling inventory levels.It is a best-ordered quantity where the total annual cost is minimum.In Basic EOQ model,Annual carrying(Holding) cost = Annual ordering cost∴ to minimize total cost, EOQ(Q) is given by,\(Q = \sqrt {\FRAC{{2D{C_0}}}{{{C_c}}}} \), where D= Annual demand, C0= Ordering cost per order, Cc= Carrying cost per unit per year, CU= per unit material cost.Calculation:Given:D = 500 × 12 = 6000 units per year, Cu= Rs. 25 per unit, Cc= 16% of Cc= 0.16 × 25= Rs. 4 per unit per year,C0= Rs. 50 per order, Q = ?Now, we know that\(Q = \sqrt {\frac{{2D{C_0}}}{{{C_c}}}} \)∴ \(Q = \sqrt {\frac{{2 \times 6000 \times 50}}{4}} = 388\;units\)Therefore the Re-order quantity is 388 units.