ten to one

If you say ten to one something will or will not happen, you mean it is very likely that it will or will not happen.

十之八九

Ten to one he won't be there tonight.

他今晚十有八九不会去那里。

No one knows for sure how they're going to deal with these sales issues, but ten to one it's the employees who have to suffer the cost.

没有人确切知道他们将如何处理这些销售问题，但十有八九要由员工来承担成本。