Thanks to everyone's input.
When I look back to my thread I appreciate your ideas and one more thing have learnt is to setup/clarify the rules before writing.
I read the links you provided and VovKa gave more handy info by pointing to Wikipedia
https://en.wikipedia.org/wiki/Rounding#Round-to-even_methodBTW I am often here to read threads and have learnt a lot, even I keep silent in most of time.
To Mark: Big thanks for building up this wonderful place. I would like to say please keep this great forum if possible.