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

The purchase price after successive discounts of 10 percent and 15 percent on 800 is 800 * 0.90 * 0.85 = 612. Adding 28 for transportation brings the total cost price to 612 + 28 = 640. Using the gain percentage formula, which is [(selling price - cost price) / cost price] * 100, we get [(800 - 640) / 640] * 100, resulting in a 25 percent gain.

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