Worked Solution
✓ VerifiedPart (a): Marginal Costing – P/V Ratio and Break-even Analysis
(i) P/V Ratio and Fixed Expenses
P/V Ratio = Change in Profit ÷ Change in Sales × 100
= (₹60 – ₹30) ÷ (₹250 – ₹200) × 100
= ₹30 ÷ ₹50 × 100 = 60%
Fixed Expenses (using 2015 data):
Contribution = Sales × P/V Ratio = ₹200 × 60% = ₹120 lakhs
Fixed Expenses = Contribution – Profit = ₹120 – ₹30 = ₹90 lakhs
Verification (2016): Contribution = ₹250 × 60% = ₹150 lakhs; Fixed Expenses = ₹150 – ₹60 = ₹90 lakhs ✓
(ii) Break-even Level of Sales
BEP (Sales) = Fixed Expenses ÷ P/V Ratio = ₹90 ÷ 0.60 = ₹150 lakhs
(iii) Sales Required to Earn Profit of ₹70 Lakhs
Required Sales = (Fixed Expenses + Desired Profit) ÷ P/V Ratio
= (₹90 + ₹70) ÷ 0.60 = ₹160 ÷ 0.60 = ₹266.67 lakhs
---
Part (b): Inventory Management – EOQ and Stock Levels for Supreme Limited
(i) Re-order Quantity (EOQ)
EOQ = √(2 × Annual Demand × Ordering Cost ÷ Carrying Cost per unit per annum)
Carrying cost per unit = 12% × ₹500 = ₹60
EOQ = √(2 × 72,000 × ₹2,250 ÷ ₹60) = √5,400,000 = 2,324 units (approx.)
(ii) Re-ordering Level
Re-ordering Level = Maximum Consumption per day × Maximum Lead Time
= 400 units × 20 days = 8,000 units
(iii) Minimum Stock Level
Minimum Stock Level = Re-ordering Level – (Average Consumption × Average Lead Time)
= 8,000 – (300 × 14) = 8,000 – 4,200 = 3,800 units
(iv) Maximum Stock Level
Maximum Stock Level = Re-ordering Level + Re-order Quantity – (Minimum Consumption × Minimum Lead Time)
= 8,000 + 2,324 – (300 × 8) = 10,324 – 2,400 = 7,924 units
(v) Danger Level
Danger Level = Average Consumption per day × Lead Time for Emergency Purchase
= 300 units × 5 days = 1,500 units
Write it like this
1The skeleton
- Write the formula in words BEFORE substituting numbers — examiners award 1 step-mark for the formula itself; if you jump straight to plugging numbers you lose that mark even when the final answer is right.
- Verify fixed costs using BOTH years in part (a)(i) — that single verification line shows examiner-level rigour and is the difference between 'knows the concept' and 'deserves full marks'.
- In part (b), state the formula for EACH stock level as its own line — EOQ, Re-order Level, Min, Max, Danger are five separate formulas; bundle them and you lose step marks on every single one.
- Carry your EOQ answer forward explicitly — write '(using EOQ = 2,324 units calculated above)' when computing Max Stock Level; examiners can't assume you're linking unless you say so.
- Box or underline every final answer — this is a 25-mark numerical; the examiner is scanning 30 scripts; your answer must pop off the page at Max = 7,924 units, not hide inside a calculation line.
- End part (a) with a one-line sanity check sentence — 'At BEP, contribution equals fixed expenses = ₹90 lakhs ✓' takes 5 seconds and prevents an examiner from docking a mark for an unchecked figure.
2Examiner-rewarded phrases
3Common trap
Watch out — in Maximum Stock Level, most students accidentally plug Average consumption × Average lead time instead of Minimum consumption × Minimum lead time, costing 2 marks. The formula has 'minimum' twice for a reason; read it out loud before substituting.