What is 80% of 100?
80% of 100 = 80
100 × 80/100 = 80
How to calculate 80% of 100
Multiply 100 by 80 and divide by 100: 100 × 80 ÷ 100 = 80. Equivalent shortcut: 100 × 0.8 = 80.
As a discount
A 80% discount on a 100 purchase saves you 80, so you pay 20. Stacking more discounts? Use the Discount & Tax Calculator — stacked discounts multiply, they don't add.
Related percentages
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