A software company has only 3 divisions that have 20, 30 and 40 employees, respectively. If the working percentage of this during a weekend were 20%, 30% and 40%, respectively, then the working percentage of the entire company during that weekend was approximately:

32

20% = \(\frac{1}{5}\) , 30% \(\frac{3}{10}\) & 40% = \(\frac{2}{5}\)

Working percentage of 1st division of company =  \(\frac{1}{5}\) × 20 = 4

Working percentage of 2nd division of company =  \(\frac{3}{10}\) ×30 = 9

Working percentage of 3rd division of company =  \(\frac{2}{5}\) × 40 = 16

Required percentage = \(\frac{4+9+16}{20+30+40}\) × 100

= \(\frac{29}{90}\) × 100 

= 32.22%

= 32% (approx).