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Discount = Original Price - Discounted Price Percentage Discount = 100* Discount / Original Price
Discount = Original Price minus Sale price.
You need to know the discounted price and either the discount amount or the discount rate. If you know the discount amount: Original Price = Discounted Price + Discount If you know the Discount Rate (percentage discount ): Original Price = 100*Discounted Price / (100 - Discount Rate)
Convert the discount into a decimal equivalent by removing the percent sign and placing the decimal 2 places to the left of the number in front of the percent sign. (25% = .25; 5% = .05, etc.). Then multiply the number that you want to find the discount for by the decimal equivalent. Example: to find how much 250 with a 15% discount is, multiply 250 x .15 (250 x .15 = 37.50).
Percentage discount = 100*(1 - sale price/original price)