Rearranging GP = 1-(cost price/selling price) gives
selling price = cost price /(1- GP)
The word 'maths' suggests UK - I got my 'O' level math in 1954!
So please check this with some data
I wonder if I ever visited your Tilbury pub
best wishes from Canada
--
Bernard V Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme
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"Tilburyboozer" <(E-Mail Removed)> wrote in message
news:6478C12C-30B4-4135-88A0-(E-Mail Removed)...
> We have a pub, and we really need to keep a close watch on profit margins.
> I
> have a formula for calculating the GP from nett cost and selling prices [
> which is 1-(cost price/sales price) ] but my maths lessons are nearly 50
> years back, and I can't work out how to calculate the price we need to
> charge
> in order to make the right margins.
>
> A younger memory will solve this in seconds, I know, so please lend a
> hand.