Number of employees from the HR department =25×5200100=1300
Number of graduate employees =1300×45100=585
Number of postgraduate employees =1300−585=715
Number of employees from the Marketing department =12×5200100=624
Number of postgraduate employees =312
Number of graduate employees =312
Number of employees from the Finance department =18×5200100=936
Number of post graduate employees =936×34=702
Number of graduate employees =936−702=234
Number of employees from the IT department =30×5200100=1560
Number of postgraduate employees =546
Number of graduate employees = 1560−546=1014
Number of employees from the Legal department =15×5200100=780
Number of graduate employees =60×780100=468
Number of postgraduate employees =780−468=312
Total number of employees in the HR, the Finance and the Legal departments together =1300+936+780=3016