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You do not.

Percentage change (increase or decrease) makes sense only if both numbers are positive or both are negative.

Consider the change from -50 to +50. You could calculate the percentage change as 100*(new-old)/old = -200%

Now consider the percentage change from +50 to -50. -200% again!

So, in percentage terms a change from +50 to -50 is the same as from -50 to +50.

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Q: How do you calculate percentage growth if the previous amount is a negative amount?
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