For the trial period on her new job windy has 20% less salary than she had on her old job. by what percent should her salary increase after the trial period to match her old salary?

25%

Step-by-step explanation:

Since Windy's salary decreased by 20%, we are left with 80% of the salary. To match her old salary, we would need our 20% back.

20/100 -> 20/80 or 1/4

1/4=25%

Her salary should increase by 25% to match her old salary.

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