Add a custom calculations

Add a custom calculations
Bryaaan07
Prix de vente 30%
??rating.lastmodif?? 10/10/2017.
Description: pour avoir 30% de marges
Expression:
({Coût production|N})/({Demande|N})+(({Budget R et D|N}+{Budget publicité|N})/({Demande|N}))*1.40

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