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The average monthly salary of a group of 7 workers in a factory is Rs. 2260. If the manager’s salary is added, the average salary becomes Rs. 3500 per month. What is the manager’s salary per month?
1. Rs. 14,560
2. Rs. 12,180
3. Rs. 13,180
4. Rs. 15,280

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Correct Answer - Option 2 : Rs. 12,180

Given

Average monthly salary of a group of 7 workers in a factory = Rs. 2260.

Average salary becomes Rs. 3500 per month if manager salary is added.

Formula Used

Sum of the observation = Average × No. of observations

Calculation

Average salary of 7 workers = Rs. 2260

Sum of salaries of 7 workers = Rs. 2260 × 7 = Rs. 15,820

Now, if manager salary is added, then average becomes Rs. 3500

Total salary of 7 workers + manager’s salary = Rs. (3500 × 8) = Rs. 28,000

Manager’s salary = Rs. (28000 – 15820) = Rs. 12,180

∴ Rs. 12,180 is the manager’s monthly salary. 

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