与去年相比，该单位职工的收入增加了50。
The average income of the staff has been increased by 50percent compared with last year.
与去年相比，该单位职工的收入增加了50%。
The average income of the staff has been increased by 50 last year.
与去年相比，该单位职工的收入已增加了50%。
The average income of the staff has been increased by 50 percent compared with last year.
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