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What is 40% of 30?
40% of 30 = 12
30 × 40/100 = 12

How to calculate 40% of 30

Multiply 30 by 40 and divide by 100: 30 × 40 ÷ 100 = 12. Equivalent shortcut: 30 × 0.4 = 12.

As a discount

A 40% discount on a 30 purchase saves you 12, so you pay 18. Stacking more discounts? Use the Discount & Tax Calculator — stacked discounts multiply, they don't add.

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