Prices Not Accurate In Combinations

[seowebmaster]

Hi, 

 

my online shop runs on Prestashop 1.6.1.4.

 

I am creating product with different combinations, each of which has a different price. The problem is that the rounding is not working fine.

 

Concrete example:

 

product base price 6.00 (with taxes) and 5.555556 (without taxes) => 8% (but I think it stores 5.56)

 

For a specific combination I add 1.50 (1.388889), but basically prestashop stores a rounded 1.39.

 

Instead of having 7.50 (6.00 + 1.50), I have 7.51 (5.56 + 1.39=6.95 + 8% => 7.506 => 7.51)

 

Why on the database are prices not stored with 6 decimals? Actually, I get 5.560000 instead of 5.555556... Why this loss of accuracy?