calculate value of operating surplus value of output=800
intermediate consumption=200
COE= 200
IT =30
Subsidies= 50
Depreciation=20
Mixed Income =100

Calculation of NDPfc
NDPfc = Value of output - Intermediate consumption - Depreciation - Net indirect Tax
           = 800 - 200 - 20 - (30 - 50)
           = Rs. 600

NDPfc = Compensation Of Employee + Operating surplus + Mixed Income
  600   =  200 + OS + 100
OS      = Rs. 300


Regards,