Add a custom calculations

Add a custom calculations
clemserge
cout TOTAL d'une unite sans R&D et pub
??rating.lastmodif?? 06/04/2020.
Description: cout TOTAL d'une unite sans R&D et pub
Expression:
({Dépenses|N}-{Budget R et D|N}-{Budget publicité|N})/({Nombre de produits vendus|N})

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