Calculate the percentage growth or increase from a starting value to an ending value.
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Percentage increase represents the relative growth of a quantity. The formula is:
\[\text{Percentage Increase} = \frac{\text{Final Value} - \text{Initial Value}}{\text{Initial Value}} \times 100\]Where the difference is divided by the initial starting value, not the final value. If the final value is smaller than the initial value, this represents a percentage decrease.