The average salary of 10 officers is 627. So the total salary of 10 0fficers will be "(10*627)=6270"
The average salary of 60 clerks is 230, so their total salary will be "(60*230)=13800"
The average salary of 400 workers is 120, so their total salary will be "(400*120)=48000"
Now, the total salary of all the employees will be "(6270+13800+48000)=68070"
And the total number of employees altogether is "(10+60+400)=470"
So, the average salary of all the employee working together will be "(68070\/470)\\approx144.83"
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