The average salary of all the staff in an office of a corporate house is Rs. 6,000. The average salary of the officers is Rs. 15,000 and that of the rest is Rs. 5,000. If the total number of staff is 300, then the number of officers is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 30.
Using the allegation method,
Officers (15000) Non-officers (5000)
\ /
Average (6,000)
Ratio = (6000 - 5000) : (15000 - 6000) = 1000 : 9000 = 1:9
Number of officers = (1/10) × 300 = 30