:RULES 
  Deprec       =  CumDepr - CumDepr(-1)
  Invest       =  Invest(-1)+@MAX(100,Cash(-1))-100
  Debt         =  @MAX(Debt(-1),Equity(-1),(60%*Invest))
  InvInc       =  Yeild * Invest
  IntExp       =  -IntRate * Debt
  PBT          =  Admin + InvInc + Deprec + IntExp 
  Taxes        =  -PBT * @LOOKUP(PBT,Bracket1..Bracket3,TRate1)
  NET          =  PBT + Taxes
  Equity       =  Equity(-1) + NET
  LIABIL       =  Debt + Equity
  ASSETS       =  LIABIL
  Cash         =  ASSETS - CumDepr - Physical - Invest