What is 90% of 20?

90% of 20 = 18

How to work it out

1. Convert the percentage to a decimal: 90 ÷ 100 = 0.9
2. Multiply by the number: 0.9 × 20 = 18

20 increased by 90% is 38; decreased by 90% it is 2 (useful for discounts).

Calculate any percentage

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