Damages unsellable

  A company runs a business and owes 4 departments. They want to track daily the damages. The formula is: (a-b)/(c+d+e+f)=0.0015 Variables: a – damages unsellable b – damages sellable c,d,e,f – damages tracked from each department. Question: Which are the constraints for a,b,c,d,e,f in order the daily damages to be