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Three common percentage problems, solved instantly — pick the one that matches what you need.
"X% of Y" multiplies Y by X divided by 100. "X is what % of Y" divides X by Y and multiplies by 100. Percentage change subtracts the original from the new value, divides by the original, and multiplies by 100 — a positive result is an increase, negative is a decrease.
(New − Original) ÷ Original × 100.