百分之

百分之

"百分之" means "percent" or "percentage" in English.

'百分之' in this sentence is used to denote an increase proportion (20%) relative to a previous state (efficiency of the machine before improvement).

这台机器的效率已经提高了百分之二十。

The efficiency of this machine has increased by 20%.

Here, '% (百分之)' represents a percentage (10%) indicating the growth magnitude of stocks within a financial context.

股票增长了百分之十。

The stock increased by 10%.

Here, '百分之' is used to indicate a fraction or percentage (50%) out of a whole group, specifically referring to the students who passed.

百分之五十的学生通过了考试。

Fifty percent of the students passed the exam.