WEBVTT

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Here is the problem: Percentage change from 50 to 40.

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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 negative 20 percent (decrease).

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The value decreased by 20 percent.

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Check: 50 plus negative 20 percent of |50| equals 40.