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Every common percentage question, answered in one place.
Pick a question type and fill in the two numbers.
X% of Y = X / 100 x Y X is what % of Y = X / Y x 100 Change = (New - Old) / Old x 100
Three everyday percentage questions, each with its own arrangement of the same division and multiplication.
What is 15% of 2,400?
15 divided by 100 is 0.15, and 0.15 times 2,400 gives 360.
Subtract the old value from the new one, divide by the old value and multiply by 100. A negative answer is a decrease.
The second percentage is applied to a larger base. Adding 10% to 100 gives 110, and 10% of 110 is 11, so you land on 99.
Yes. Fractional percentages such as 7.5% work in every mode.
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