By selling a shirt for ₹1,890, a shopkeeper loses 10%. What was the cost price?

💡 Solution & Explanation

A 10% loss means the selling price is 90% of the cost price. So cost price = ₹1,890 × 100 ÷ 90 = ₹2,100. Check: 10% of ₹2,100 is ₹210, and ₹2,100 − ₹210 = ₹1,890. Adding 10% to ₹1,890 gives ₹2,079, which is wrong because the loss is a percentage of the cost, not of the selling price.