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1 .
The average monthly salary of employees, consisting of officers and workers, of an organisation is Rs. 3000. The average salary of an officer is Rs. 10000 while that of a worker is Rs. 2000 per month. If there are a total 400 employees in the organisation, find the number of officers.
[ A ]    50 right
[ B ]    60
[ C ]    80
[ D ]    40
[ E ]    None of these
Answer : Option A
Explanation :
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