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How do I calculate the percentage difference between two percentages [University Statistics]?

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Percentages always mean percentage **of something**.

In this case, let's say 16.7% of apples were green last year, and this year it's 19.0%. I'm sure your university course focuses *heavily* on apples.

That's an increase of 2.3% **of the total apples**.

But the **proportion** of apples increased from 16.7%, by 2.3/16.7 = 13.8%. The 13.8% refers to the **proportion of green apples in last year's harvest**.

General moral—to repeat—percentages are always percentages **of something**, and you have to be clear what that something is.
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nice

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