I’m getting an 11.11% return rate for 1 out of 9. For 9% it would be 9 out 0f 100, and 1 out of 10 would be 10%.
Oops. Not enough coffee when I posted that. I’m usually pretty good at math. 
I have been and was, right up until Calculus my freshman year. It seems that 7:15 or 7:30 AM classes and 18 year old beer bars are NOT a good formula for success. So much for that Nuclear Engineering program.
Oh well, they didn’t teach us how to build the bomb until our senior year anyway. Now you can get the info on the internet…