private double calcUtil4Performing(final double typDuration,final double actualDuration){
  return 10 * marginalUtilPerformingSec + marginalUtilPerformingSec * typDuration * Math.log(actualDuration / typDuration);
}

private double calcUtil4Performing ( final double typDuration , final double actualDuration ) { return 10 * marginalUtilPerformingSec + marginalUtilPerformingSec * typDuration * Math . log ( actualDuration / typDuration ) ; }
only true if all activities have same priority
