40% of the employees in a factory are workers and the rest are executives. Each worker earns Rs. 39,000 annually and each executive earns Rs. 42,000 annually. What is the average annual income of all employees together?
ARs. 40,500
BRs. 40,800 ✓ Correct
CRs. 41,000
DRs. 41,500
Correct answer: (B) Rs. 40,800
Explanation
The average annual income is Rs. 40,800.
Workers are 40% and executives are 60% of the employees.
Weighted average = 0.4 x 39000 + 0.6 x 42000.
= 15600 + 25200.
= Rs. 40,800.
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