40% of the employees in a factory are workers. All the remaining employees are executives. The annual income of each worker is 390rs. The annual income of each executive is Rs. 420. What is the average annual income of all the employees in the factory together?
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Correct answer: D
Explanation
Let the total number of employees is 100.
Workers = 40% = 40
Executives = 60% = 60
Total income of workers = 40 × 390 = 15,600
Total income of executives = 60 × 420 = 25,200
Total income = 15,600 + 25,200 = 40,800
Average annual income = 40,800 / 100 = 408