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If in the marketing department of MNC, the average salary per employee is Rs. 400, average salary of 10 senior employees is Rs. 550 per employee and average salary of remaining staff is Rs. 100 per employee, what is the total number of employees of working in the marketing department?   
1. 15
2. 5
3. 10
4. 11

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Correct Answer - Option 1 : 15

Given:

The average salary per employee in the marketing department of MNC is Rs. 400.

The average salary of 10 senior employees = Rs. 550 per employee

The average salary of the remaining staff = Rs. 100 per employee.

Concepts used:

Average salary = (Total salary of all employees)/(Number of employees)

Calculation:

Let the total number of employees in the marketing department of MNC be x.

Total salary of all employees = Rs. 400 × x = Rs. 400x

Total salary of all senior employees = Rs. 550 × 10 = Rs. 5,500

Remaining staff = Total number of employees - Number of senior employees = x – 10

The average salary of the remaining staff is Rs. 100 per employee.

Total salary of remaining employees = Rs. (100x – 1,000)

Total salary of all employees = Total salary of all senior employees + Total salary of remaining employees

⇒ 400x = 5,500 + 100x – 1,000

⇒ 400x – 100x = 4,500

⇒ 300x = 4,500

⇒ x = 4,500/300

⇒ x = 15 employees

∴ There are total 15 employees working in the marketing department of MNC.

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