Price per box in Prestashop

Hi

I'm Building an online store, that deals with Tiles. My problem is that my prices are in sqm, but I have to sell the products by the boxes, that contain 1.2 - 1.4 Sqm of tiles.

I would like for the original price to appear everywhere, the price for sqm, but as soon as they click on the cart button, they will get the price that is 1.4 times the sqm price, because that is how much is in a box.

Here is a site that has exactly what I need: [url removed, login to view]

Færdigheder: PHP, Prestashop

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Projekt-ID: #4059989