How to calculate percentage discount between two numbers?
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The percentage change between two numbers depends on whether we are considering a reduction in value or an increase.
A reduction in value will always result in a higher percentage change than will an addition in value. That's because the higher the base, the lower the percentage for any given change.
For example:
Reduction from 25 to 20 will result in a 20% reduction (25-20=5/25x100).
Whereas:
Increase from 20 to 25 will result in a 25% increase(25-20=5/20x100).
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to calculate percantage decrease first: work out of differnce decrease between the two no. you are comparing then divide the decrease by the original no. and multiply the answer by 100. if your answer is a negative number then this a percantage increase
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