A shopkeeper purchased an article at Rs.800, at two successive discounts of 10% and 15% respectively. He spent Rs.28 on transportation and sold the article for Rs.800. His gain percent is

After 10% discount: 800 × 0.9 = 720. After additional 15% discount: 720 × 0.85 = 612. This is the purchase price. Adding transportation: 612 + 28 = 640 (total cost). Selling at 800 gives profit = 800 - 640 = 160. Gain percent = (160/640) × 100 = 25%. Wait, gain is calculated on cost price, not marked price. The question says 'sold for Rs.800' - this must be the selling price, not marked price. My calculation is correct: 25% gain on cost of 640.