If an item marked at ₹1,100 is sold for ₹330, what is the discount percentage?

Discount percentage is calculated using the formula: Discount % = (Discount / Marked Price) × 100, where Discount = Marked Price − Selling Price.

1. Let Marked Price (MP) = ₹1,100 and Selling Price (SP) = ₹330.

2. Discount = MP − SP = ₹1,100 − ₹330 = ₹770.

3. Discount % = (Discount / MP) × 100 = (770 / 1,100) × 100 = 70%.

Cross-check: a 70% discount means the selling price equals 30% of the marked price. 30% of ₹1,100 = ₹330, which matches the selling price given in the question, confirming the calculation.