The total number of employees are 80. I know that because 25 is quarter of 100 and if 20 employees are 25%, all I need to do is 20*4 which is 80. Hope this helped!
We have to bear in mind that any number should be less than 5 to make the square root be an imaginary number. Starting with 4 = square root (4 - 5) = square root (-1) = imaginary
