percentages

angeldraws | 20:45 Wed 05th Mar 2008 | How it Works

8 Answers

Hi
i know how to work out a percentage and add it on e.g. VAT but how dya find out what an amount is BEFORE the VAT is added on e.g. �235. Can anyone tell me how to work this out please? TIA

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funnygirl

One way I was taught, is using a calculator
divide the sum by 5.71, the reverse of 17.5 and then add it on!!

But I don't how to find out what it was originally unless you do this and subtract.

Loosehead

ok we know �235 is the result of some number, say N x 1.175 so, using school equation rearrangement techniques:

N x 1.175 = 235 - take x 1.175 over the other side where it becomes divide - so

N = 235/1.175 = 200

Tada!

wardie100

one way i found easiest to understand is:

if you divide 235 by 117.5 y(100% plus the added17.5%) you get what 1% would be,
then you just need to times this by 100 to get what 100% would be.
i.e (235/117.5)x100

Buenchico

I hope that FunnyGirl wasn't a pupil in one of my maths classes!

As others have said, to add 17.5% on (in a single calculation) you multiply by 1.175.

Therefore, to 'undo' that calculation, you simply divide by 1.175.

Chris

angeldraws

Question Author

Thats great - thanks guys - think i can do that now