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What is 90% of 20?
90% of 20 = 18
20 × 90/100 = 18

How to calculate 90% of 20

Multiply 20 by 90 and divide by 100: 20 × 90 ÷ 100 = 18. Equivalent shortcut: 20 × 0.9 = 18.

As a discount

A 90% discount on a 20 purchase saves you 18, so you pay 2. Stacking more discounts? Use the Discount & Tax Calculator — stacked discounts multiply, they don't add.

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