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This is surely way below the level of maths questions you normally get on here but please humor me!

I have written a simple app that compares beer offers and works out the best (cheapest) price per 100ml. It works it out using the calculation written below:

function getPricePer100ml(cansize, cansinpack, numberofpacks, cost) {   var totalCans = cansinpack * numberofpacks;   var totalMl = totalCans * cansize;   var total100Mls = totalMl / 100;   return cost / total100Mls; } 

I run this twice to get each offers price per 100ml and then the lowest price "wins".

The issue I am having is understanding what I need to do on top of this to factor in the ABV (strength) of the beer. This is in % so for example:

offer1per100ml = 0.65p - 3.8%ABV offer2per100ml = 0.75p - 5.2%ABV 

My app would class offer 1 as the winner because its cheaper per 100ml but I suspect that you get more bang for your buck by paying the extra 10p and buying the strong stuff.

How can I write this mathematically? Or am I approaching this wrong?

Thanks for your input!

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    haha thanks I'll try plugging that in tonight - is that the get wasted quickest metric? :)2012-06-27

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