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# how could i quickly work out the percentage increase? watch

1. What is the resulting percentage increase in the value of the expression if each letter increases by 20% ?
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2. (Original post by BDunlop)
What is the resulting percentage increase in the value of the expression if each letter increases by 20% ?
Example: If you had the expression

then a percentage increase of 20% in each variable would result in

So you end up with a 44% increase in the value of the whole expression.

I know yours is harder but try and follow the same process and post all your working / thoughts if you get stuck.
3. (Original post by Notnek)
Example: If you had the expression

then a percentage increase of 20% in each variable would result in

So you end up with a 44% increase in the value of the whole expression.

I know yours is harder but try and follow the same process and post all your working / thoughts if you get stuck.
okay, thanks. What i was getting confused about was what to do with the constants, e.g. do i need to bother dividing by 2 etc. can you just ignore all these values and focus on the values which change?
4. (Original post by BDunlop)
okay, thanks. What i was getting confused about was what to do with the constants, e.g. do i need to bother dividing by 2 etc. can you just ignore all these values and focus on the values which change?
Yes you can ignore the constants. Or you could keep them in and it won’t make much difference.

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