Question 1

How do I calculate 20% off a price?

Accepted Answer

Multiply the original price by 0.20 to find the discount amount, then subtract from the original. Or simply multiply by 0.80 for the final price.

Question 2

What is the original price if I know the sale price and discount?

Accepted Answer

Divide the sale price by (1 – discount%). For example, a $80 item at 20% off had an original price of $80 ÷ 0.80 = $100.

Question 3

How do I calculate successive discounts?

Accepted Answer

Apply discounts one at a time. A 20% then 10% discount is not 30% off — it's 28% off (you pay 80% then 90% of that).

Discount Calculator

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