By selling a music system for Rs. $9000$ Rahul incurred a loss of $10$%. Had he sold it at Rs. $12000$, what would be his loss or profit percent?

Using the cost price formula Cost Price = Selling Price * 100 / (100 - Loss Percent), the cost price is 9000 * 100 / 90 = Rs 10000. If sold for Rs 12000, the new profit is 12000 - 10000 = Rs 2000. Applying the profit percent formula (Profit / Cost Price) * 100 gives (2000 / 10000) * 100 = 20%.

• Thanks
• Wrong explanation