Correct Answer - Option 2 : Rs.25
Quantity of dal bought by the shopkeeper = 18 kg
Ratio of costlier and cheaper item mixed = 7 ∶ 2
∴ Quantity of costlier item = (7/9) × 18 = 14
Quantity of cheaper item = (2/9) × 18 = 4
Price of the mixture = 14 × 120 + 4 × 80 = Rs.2000
Price marked by shopkeeper = 18 × 120 = Rs.2160
Now, 6.25% discount offered
∴ Cost price of the mixture = 2160 × (15/16) = Rs.2025
∴ Profit of the shopkeeper = 2025 – 2000 = Rs.25