\(40\%\) 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. \(420\)
OA C