How to display prices in value ?

[Leana]

Hello,

I have a problem with Prestashop 1.7 because everytime I want to do a mathématiques equation with price value, it turns out wrong :

For the value "price", I found out the value "price_amount" which shows the decimals

But for the value "discount", I don't know how to do...

{$unit_price = $quantity_discount.discount|floatval}

I tried Floatval, but it doesn't change anything..

Thanks for your help !