40% of the employees in a factory are workers. All the remaining employees are executives. The annual income of each worker is $390. The annual income of each executive is $420. What is the average annual income of all the employees in the factory together?

Question: 40% of the employees in a factory are workers. All the remaining employees are executives. The annual income of each worker is $390. The annual income of each executive is $420. What is the average annual income of all the employees in the factory together?

Solution:
ধরি, মোট কর্মচারী = 100 জন

ATQ,
Workers = 40% = 40 জন
Executives = 60% = 60 জন

∴ Workers এর মোট আয় = 40 × 390 = 15,600
∴ Executives এর মোট আয় = 60 × 420 = 25,200

∴ মোট আয় = 15,600 + 25,200 = 40,800
∴ গড় আয় = 40800/100 = 408

∴ গড় বার্ষিক আয় = $408.