The average monthly salary of employees, consisting of officers and workers, of an organisation is Rs. 3000. The average salary of an officer is 10,000 while that of a worker is 2000 per month. If there are total 480 employees in the organisation, find the number of officers.
Explanation:
Ratio of officers to workers = 1000 : 7000 = 1 : 7
Number of officers = 1/8 × 480 = 60
Alternately, Let the number of officers be x
Number of workers = 400 – x
⇒ 10000 × x + 2000(400 - x) =3000(400)
⇒ 10000x + 800000 - 2000x = 12,00,000
⇒ 4x = 600 - 400 = 200
⇒ x = 50
∴ Number of officers = 50
Hence, option (a).
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