Percentage Increase / Decrease
Two directions in one tool: find the % change between two numbers, or apply a % change to a starting number.
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The formulas
% change = ((new − old) ÷ old) × 100 — a positive result is an increase, negative is a decrease.
new value = old × (1 ± percentage ÷ 100) — add for an increase, subtract for a decrease.