Question 1

How do I calculate a percentage of a number?

Accepted Answer

Multiply the number by the percentage divided by 100. For example, 25% of 200 = 200 × (25/100) = 50.

Question 2

How do I calculate percentage change?

Accepted Answer

Percentage change = ((New Value - Old Value) / Old Value) × 100. Positive means increase, negative means decrease.

Question 3

What is the difference between percentage and percentage points?

Accepted Answer

Percentage points measure the arithmetic difference between two percentages. Going from 10% to 15% is a 5 percentage point increase, but a 50% relative increase.

Question 4

How do I reverse a percentage?

Accepted Answer

If you know the result and percentage, divide the result by the percentage (as a decimal). If 30% of X = 60, then X = 60 / 0.30 = 200.

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