Explanation:

- The laptop was sold for Rs. 22,400 with a 20% discount. Therefore, the marked price (MP) = \( \frac{22,400}{0.8} = 28,000 \) Rs.

- The shopkeeper made a 12% profit on the cost price (CP).

- Let CP = \( x \).

- Then, \( x \times 1.12 = 22,400 \). Solving this gives \( x = 20,000 \) Rs.

- If sold at the marked price, revenue = Rs. 28,000.

- Profit at marked price = \( 28,000 - 20,000 = 8,000 \).

- Profit percentage = \( \frac{8,000}{20,000} \times 100 = 40\%\).

- Correct Answer: Option:2 - 40%