How do I calculate what percentage X is of Y?

Divide X by Y, then multiply by 100. For example, 25 is 50% of 50 because 25 ÷ 50 × 100 = 50.

How do I calculate a percentage increase?

Subtract the original from the new value, divide by the original, then multiply by 100. For example, going from 80 to 100 is a 25% increase.

15% of 200 is 30. Multiply 200 by 0.15 to get the answer.

计算百分比，或求一个数是另一个数的百分之几。

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