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How to calculate discount, including 40% + 10% offers

Updated: 14 November 2026

Open the discount calculator

How to calculate discount: multiply the price by (1 − discount ÷ 100). The trap is stacked offers. An “extra 10% off” is taken from the already reduced price, so 40% + 10% saves 46%, not 50%.

Quick answer

  • Final price = price × (1 − discount ÷ 100).
  • ₹2,999 at 40% off is ₹1,799.40. An extra 10% off that is ₹1,619.46.
  • Total saving: ₹1,379.54, which is a real discount of 46%.
  • Two discounts d1 and d2 combine to 1 − (1 − d1)(1 − d2), never d1 + d2.

One discount

Final price = price × (1 − discount ÷ 100)
Saving = price − final price

₹2,999 at 40% off: 2,999 × 0.60 = ₹1,799.40.

Stacked discounts

The second discount applies to the reduced price:

Final price = price × (1 − d1 ÷ 100) × (1 − d2 ÷ 100)

OfferPrice afterReal discount
40% off ₹2,999₹1,799.4040%
40% + extra 10%₹1,619.4646%
20% + extra 10%28%
50% + extra 20%60%

Finding the discount from two prices

Discount % = (original − sale price) ÷ original × 100. A ₹1,500 item sold at ₹1,200 is 20% off. The percentage calculator does this as a percentage change.

Before or after GST?

On a GST invoice, a discount shown on the invoice is usually taken off before tax is worked out. A shelf price in India normally already includes GST. Check the bill to see how the discount was applied. The GST calculator splits a GST-inclusive price.

“No-cost EMI” is a discount question too

A no-cost EMI often means the interest is given back as a discount, sometimes with fees left in. See whether no-cost EMI is really free.

How to use the discount calculator

  1. Enter the original price.
  2. Enter the discount, and any extra discount offered on top.
  3. Read the final price, the saving and the real discount.

Limits

Arithmetic only. Shops may round prices, apply coupons in a different order, or exclude some items. The bill decides.

Sources

If this page and the official notice disagree, follow the notice.

FAQ

How do I calculate a discount?
Final price = price × (1 − discount ÷ 100). Saving = price − final price.
Is 40% + 10% the same as 50% off?
No. The extra 10% is taken from the reduced price, so the total is 46%.
What is ₹2,999 after 40% + 10% off?
₹1,619.46. You save ₹1,379.54.
How do I find the discount percentage from two prices?
(Original − sale price) ÷ original × 100. ₹1,500 to ₹1,200 is 20%.
Is discount taken before or after GST?
On an invoice, an invoice discount is usually deducted before GST. Shelf prices in India normally include GST.

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