What is 30% of 40?

30% of 40 = 12

How to work it out

1. Convert the percentage to a decimal: 30 ÷ 100 = 0.3
2. Multiply by the number: 0.3 × 40 = 12

40 increased by 30% is 52; decreased by 30% it is 28 (useful for discounts).

Calculate any percentage

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