setting prices of circular objects using an equation to calculate increases in size/cost

by Kristen
(victoria, australia)

I'm trying to make an equation to price the wishing trees I make, I have a base unit of $50 for a 27cm diameter one ..... the smallest one is the simplest to calculate materials and time which I have done, from that point I would like to be able to add 1cm to that size (1cm = $2) so far so good :) now here is where I'm struggling; that increase doesn't account for the entirety of the increase in size ... as the trees get bigger the total value of each 1cm gets bigger ..... my thinking is that the next part of the equation needs to be a multiplication by a percentage of the total or needs to rub up against pi somehow ....... blink blink ... sigh .... any thoughts would be much appreciated :)

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