WEBVTT

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Here is the problem: Percentage change from 80 to 100.

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Measure how much a value changed relative to its original value.

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Subtract the original value from the new value.

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Divide the change by the absolute value of the original.

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Multiply by 100.

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So the answer is 25 percent (increase).

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The value increased by 25 percent.

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Check: 80 plus 25 percent of |80| equals 100.