code: public static final Double getPercentage(byte[] data, int offset)
     {
        int value = MPPUtility.getShort(data, offset);
        Double result = null;
        if (value >= 0 && value <= 100)
        {
           result = NumberHelper.getDouble(value);
        }
        return result;
     }
docs: Utility method to read a percentage value.
  
  @param data data block
  @param offset offset into data block
  @return percentage value