How do I calculate percentage of a number?

Divide the percentage by 100 and multiply by the number. For example, 25% of 200 = (25/100) × 200 = 50.

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

Divide the part by the whole and multiply by 100. For example, 50 is what % of 200? (50/200) × 100 = 25%.

Subtract the old value from the new, divide by the old value, then multiply by 100. A positive result means increase, negative means decrease.

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