Problem with volume discounts final price calculation

[eduu1988]

Hi, 

I'm new here. It's and honor to post my first doubt/problem.

I'm working with a Prestashop 1.6

The problem is:

I set a specific price for one product based on volume (let say, 5% discount from 100 units or more), because of the item price without discount is very small (0,05€), that 5% of discount isn't enough to lower de price of each item at least 0,01€ (that would be a 20% discount)... so none discount is applicated.

When I set a discount to 11%, it rounds up to 20%, in order to set the discount price per unit to its minimum 0.01€.

I've seen that in the template, the "percentage_discount" is calculated based on the price with and without discount (0,05€ and 0,04€), so it allways rounds to 20%, 40%, 60%... etc.

I supposed that the percentage_discount should not be calculated that way, but, in any case, I think the problem could be solved if the prices with and without discount wouln't be rounded to two decimals (0,05€, 0,04€, etc). They could be displayed rounded with two decimals but internaly the calculations to be made with a lot more of them. How can this be achieved? Any ideas?

Thank you very much in advance.