We have a 'fifty-fifty' chance of succeeding. [=we are as likely to succeed as we are to fail]
The bill for dinner came to $43, and she gave him a 'fifty'.
They divided/split the expenses 'fifty-fifty'. [='equally']
(..) - You got a job? I was laughed out of twelve interviews today. And yet you're surprisingly upbeat. You would be too if you found John and David boots on sale, fifty percent off! Oh, how well you know me... They're my new 'I don't need a job, I don't need my parents, I've got great boots' boots! (..)1994 TvShow: Friends Title: The One Where Monica Gets a Roommate Season: 1 Episode 1