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

How to calculate 90% of 100

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

As a discount

A 90% discount on a 100 purchase saves you 90, so you pay 10. Stacking more discounts? Use the Discount & Tax Calculator — stacked discounts multiply, they don't add.

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