A laptop is marked up by 20% from its cost price. A discount of 15% is then applied to the marked price. If the final selling price is $1020, what was the original cost price of the laptop?

✓ Correct Answer: Option B

Let C be the cost price. Marked price = C * (1 + 0.20) = 1.20C. Selling price = Marked price * (1 - 0.15) = 1.20C * 0.85 = 1.02C. Given 1.02C = 1020, so C = 1020 / 1.02 = $1000.