Worked Solution
✓ VerifiedAnswer: (C)
For raw material 'OE', the Economic Order Quantity (EOQ) is calculated using the formula: EOQ = √(2DS/H), where D = Annual Demand, S = Ordering Cost per order, and H = Holding Cost per unit per annum.
Holding Cost Calculation (H):
H comprises Storage Cost + Interest Cost (Obsolescence not specified for OE, so excluded):
Storage Cost = Storage Rate × Price = 3.5% × ₹200 = ₹7 per unit per annum
Interest Cost = Interest Rate (annualized) × Price = (1.25% per quarter × 4) × ₹200 = 5% × ₹200 = ₹10 per unit per annum
Total H = ₹7 + ₹10 = ₹17 per unit per annum
EOQ Calculation:
EOQ = √(2 × 3,125 × 500 / 17) = √(3,125,000 / 17) = √183,823.53 ≈ 429 kgs (closest to option C)
Write it like this
1The skeleton
- Annualize the interest rate first — OE gives 1.25% per quarter, so you multiply ×4 to get 5% p.a. before touching anything else; one missed conversion and your entire H is wrong.
- Build H line by line: Storage + Interest, no obsolescence for OE — write each component separately so the examiner sees your working; OE has no obsolescence mentioned, so don't add it just because OC had it.
- Substitute into EOQ = √(2DS/H) showing the numbers — even in MCQ, write the substitution step (√(2 × 3125 × 500 / 17)) so partial credit is possible if your final value is off due to rounding.
2Examiner-rewarded phrases
3Common trap
The single biggest trap here is using 1.25% directly as the interest rate instead of converting it to 5% per annum — most students miss the 'per quarter' qualifier and compute H as ₹9.50 instead of ₹17, landing on a completely wrong EOQ. Also watch out for copy-pasting OC's obsolescence rate onto OE — the question deliberately leaves it out for OE.