the average monthly salary of 11 workers and 1 officer in an organisation is rupees 600 when the officer who salary was 1600 per month retired a new officer was appointed and the average salary of the 12 employee is 570 per month the salary of new officer is?
(a) 1280
(b) 1240
(c) 1220
(d) 1280
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Answer:
(b) 1240
Step-by-step explanation:
Average monthly salary of 11 workers and 1 officer = Rs.600
Average = Sum of observations / No. of observations
Sum of observations = No. of observations * Average
Sum of salary of 11 workers and 1 officer = 600 * 12 = 7200
When the new officer was replaced, the average salary of the 12 employees fell to Rs.570
=> Sum of salaries of 12 workers = 570*12 = 6840
Difference in sum = 7200 - 6840 = 360
This means that the total salary of 12 workers dropped by Rs.360
The salary of 11 workers remained the same, so what dropped was the salary of the officer who was replaced.
The salary of the old officer = Rs.1600
=> The salary of the new officer = Rs.1600 - Rs.360 = Rs.1240 (Option b)
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