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I'm using the following formula to show pergentage discount on frontend

$sconto =  100 - ($_product->getFinalPrice() / $_product->getPrice())*100);

It's working well with > 1 € prices, but failes with this case:

  • Full price 0,90 €
  • Discounted price 0,86 €
  • Discount (by catalog price rule): 5%
  • Discount showed: 4%

I think it is a round problem, but I don't now how to solve.

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