九分九厘

Etymology
lit. 'Nine ' and nine , with bu referring to $1/10$ and rin'' to $1/100$. Since 1 bu is 10 rin, the total 9 bu and 9 rin is equivalent to 99 rin, which here is contrasted against the remaining $1/100$ (or 1 rin).

Noun

 * 1) a hundred to one, a near certainty