Contribution - Price per KG under Price almost finished help

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Hi all

This is a small contribution which is finished for shop with one currency, but for shops that use more than one currency, it is not quite finished and I need some help here.

Calculating the “Price” per KG of a product and show it in the products_info_php page under the Price.

UK Pound or whatever...

Kg = 1000 gr
From weight field = 500 gr
From price field   = 0.89

The actual formula would be: 1000 / 5000 = 2 x 0.89 = 1.78
see below

<?php
// salvo added to show by the  KG/LT
           if ($product_info['products_weight'] > 0) {
           $KG_LT = round((1000/$product_info['products_weight'])*($product_info[products_price]), 2);
           echo '(', $currency, '&nbsp;', $KG_LT, '&nbsp;', per, '&nbsp;', Kg./Lt.')';
} else {
};
?>

And This works very very Well (GBP 1.78 per Kg)

The Problem would be if one has two or more currency

I chage the currency to Euro and it shows:
Euro Price = 1.25 (this is fine)
price per KG   (EUR 1.78 per Kg)   this should be  EUR 2.50

This means that there is something in the formula NOT correct 

Can someone help?

Thanks