Question 1

How do I calculate what percentage X is of Y?

Accepted Answer

To find what percentage X is of Y, use the formula: (X ÷ Y) × 100. For example, 25 is what percentage of 200? Answer: (25 ÷ 200) × 100 = 12.5%.

Question 2

How do I calculate X percent of a number?

Accepted Answer

To calculate X% of Y, use the formula: (X ÷ 100) × Y. For example, 15% of 300 = (15 ÷ 100) × 300 = 45.

Question 3

How do I calculate percentage increase or decrease?

Accepted Answer

Percentage change = ((New Value - Old Value) ÷ Old Value) × 100. If the result is positive it's an increase; if negative, it's a decrease. Example: from 80 to 100 is ((100-80)÷80)×100 = 25% increase.