calculate new price and update column price in products

[bertjebel]

I have been looking for a module that add's margin and extra costs and recalculate it as price.

Since there isn't a module like that i want to try it myself. No problem with adding fields into table products and updating them.

What i can't seem to find out is how i get this -- (cost price * margin) +extra cost + extra cost1 -- into table products and the column price. It seems to be done in admin/controler/catalog/product.php but how??

i think it has to be something like this

$updated_price = ($cost_price * margin) +$extra cost + $extra cost1);
$updated_price == $price;


anyone idea's on how to script that? I'm not a great scripter