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# Percentages - Reversing a Percentage Calculation?

Posted on 2008-06-18
Medium Priority
435 Views
Last Modified: 2008-06-18
Hi Guys,

I have a trade price  of an item, for example £30.00.

When we buy this item, the supplier gives us a discount of 10%

The Gross Trade Price is then £27.00 (30.00 - 10%)

This is my problem, I need to calculate the Trade price if the supplier only tells us the Gross Trade Price.

My Question is, how do i get the value of £30.00 from the values £27.00 and 10% ??

i.e. 10% of 27 is 2.7 ... not 3!

Thanks Experts!
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Question by:Gweep
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4 Comments

LVL 53

Expert Comment

ID: 21813228
trade_price = gross_trade_price * 100 / (100 - percentage)
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Accepted Solution

Infinity08 earned 2000 total points
ID: 21813235
Or for your example :

trade_price = 27 * 100 / (100 - 10) = 30
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Author Comment

ID: 21813365
Yep - That works perfectly.

Thanks for such a quick answer!
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LVL 53

Expert Comment

ID: 21813373
No problem :) Glad to be of assistance.
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