Butternut,

Obviously your simplified theory of adding the percentages does not work. How can one in 5 winners be an 85% chance. Does that mean 1/6 is a 102% chance? There is no such thing.

I've worked it out for you, free of charge.

No need to ask others to do it.

Good luck with your system. If you ever get ahead put the money in your pocket and change tactics. Like casino games and poker machines, the longer you play the better chance you have of losing.