27000÷ 1000=27>25

There are more than 25 people

{ 1000-(X-25)*20}X=27000

1500X-20X？ -27000=0

X 1=30

X2=45 (truncated)

Because when X=45, {1000-(45-25) * 20} = 600.

, does not match the meaning of the question.

The number of employees is 30.