$40\%$ of the employees in a factory are workers. All the remaining employees are executives. The annual income of

$40\%$ 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?

A. $390$
B. $405$
C. $408$
D. $415$
E. $420$

The OA is C

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