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**CIV****Member**- Registered: 2014-11-09
- Posts: 69

I know it to be the difference divided by the average and multiplied by 100. My one professor said to calculate the % difference you basically: 100((a - b) / b). I'm doing linear approximation in my math book and it wants the % difference and it mentioned the same thing: 100((approx - exact) / exact). What is this? I'm confused.

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**thickhead****Member**- Registered: 2016-04-16
- Posts: 1,086

Please see bobbym's signature.It says 'In mathematics, you don't understand things. You just get adjusted to them". It is true for percentage.Percentage is defined as (final-initial)/initial *100. If a quantity changes from 100 to 200 it is 100% increase. From 200 if it comes back to 100 it is only 50% down. It is defined this way to reduce heart attacks resulting from crash in stock market.Actually every body is confused about the definition but is not aware of it.

**{1}Vasudhaiva Kutumakam.{The whole Universe is a family.}(2)Yatra naaryasthu poojyanthe Ramanthe tatra Devataha{Gods rejoice at those places where ladies are respected.}**

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