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Special price per unit - wrong tax calculation in prestashop

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Product with special price - price discount per quantity

TAX is 22%

Calculation should be:

Regular price (tax incl.) 4.9€ / unit. 

Special price (tax incl) if quantity is 15pcs: 4.3 € / unit

Delivery (tax incl). 3.5€

So calculation at quanitity 15 pcs is:

15x 4.3 = 64.5€ tax included

delivery: 3.5 € tax incluced

tax included in price: 12.26 €

TOTAL PRICE (tax incl) 68€


Prestashop has wrong calculation: 

15  pcs    64,50 € (tax incl)

Deliver (tax incl)   3,50 €


Total price (tax incl)   68,00 €

tax     12,33 €


As shown above right amount of tax must be 12.26, prestashop calculation is 12.33. 

Products with regular price do not have such problem. 

How to fix it?

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