Add a custom calculations

Add a custom calculations
jukles
Tous les invest (hors machine) par piece
??rating.lastmodif?? 11/08/2014.
Description: formation + infra + R&D + Pub
Expression:
({Budget formation ouvriers|N}+{Budget publicité|N}+{Budget R et D|N}+{Investissements Entrepôt|N}+{Intérêts|N})/{Production réelle|N}

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