A stationery shop owner buys three types of notebooks. The first type costs him 5 notebooks for ₹20, the second 2 notebooks for ₹9, and the third 10 notebooks for ₹45. He mixes them in the ratio 3 : 4 : 3. If he sells all notebooks at 4 for ₹19, what is his approximate gain or loss percentage?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. Profit of 9.2%.
Cost per notebook:
C1: 5 for 20 → ₹4
C2: 2 for 9 → ₹4.5
C3: 10 for 45 → ₹4.5
Ratio = 3 : 4 : 3
Total CP = 3 × 4 + 4 × 4.5 + 3 × 4.5 = 12 + 18 + 13.5 = ₹43.5 (for 10 notebooks)
CP per notebook = 4.35
Selling price = 4 for 19 → ₹4.75 per notebook
Profit per notebook = 4.75 − 4.35 = ₹0.40
Profit % = × 100 = 9.2% gain