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Preliminary Calculations:
Annual production required = Sales demand − Opening stock of Product X = 5,00,000 − 12,000 = 4,88,000 units
Since A:B = 1:4 (by units) and 4 units of Material A are required per unit of Product X, Material B required per unit = 4 × 4 = 16 units.
Net annual purchases (after adjusting opening raw material stock):
- Material A: (4 × 4,88,000) − 24,000 = 19,52,000 − 24,000 = 19,28,000 units
- Material B: (16 × 4,88,000) − 52,000 = 78,08,000 − 52,000 = 77,56,000 units
Carrying cost per unit p.a.: C_A = 13% × ₹150 = ₹19.50; C_B = 13% × ₹200 = ₹26.00
Ordering cost (O) = ₹15,000 per order
(i) EOQ — Separate Purchase Orders [₹15,000 per material per order]
EOQ = √(2DO/C)
EOQ for A = √(2 × 19,28,000 × 15,000 / 19.50) = √2,96,61,53,846 ≈ 54,465 units
EOQ for B = √(2 × 77,56,000 × 15,000 / 26) = √8,94,92,30,769 ≈ 94,600 units
(ii) EOQ — Combined Purchase Orders [one ₹15,000 ordering cost covers both materials]
When ordered together, A and B must be ordered at the same frequency. The optimal number of combined orders per year:
n = √[(D_A × C_A + D_B × C_B) / (2 × O)]
= √[(3,75,96,000 + 20,16,56,000) / 30,000]
= √[23,92,52,000 / 30,000] = √7,975.07 ≈ 89.3 orders p.a.
EOQ for A (combined) = 19,28,000 ÷ 89.3 ≈ 21,590 units per order
EOQ for B (combined) = 77,56,000 ÷ 89.3 ≈ 86,853 units per order
Note: Under combined ordering, the company places fewer total orders (89.3 vs 35 + 82 = 117 separate orders), saving ordering costs; carrying costs adjust accordingly.