Question 1

How do I calculate a percentage?

Accepted Answer

Multiply the number by the percentage divided by 100. For example, 25% of 80 = 80 × 0.25 = 20.

Question 2

How do I find what percent one number is of another?

Accepted Answer

Divide the part by the whole, then multiply by 100. For example, 30 is what percent of 200? Answer: (30/200) × 100 = 15%.

Question 3

How do I calculate percentage change?

Accepted Answer

Percentage change = ((New Value - Old Value) / Old Value) × 100. A positive result means an increase; a negative result means a decrease. For example, a price that goes from $40 to $50 is a 25% increase: ((50-40)/40) × 100 = 25%.

Question 4

What is the difference between percentage and percentage points?

Accepted Answer

A percentage is a ratio expressed out of 100. Percentage points measure the arithmetic difference between two percentages. If an interest rate goes from 3% to 5%, it increased by 2 percentage points, but the percentage increase is (5-3)/3 × 100 = 66.7%.

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