The average salary of managers is x and the average salary of workers is y. The number of the managers is 15 times of the number of workers. What is average salary of managers and workers together?

A

$$\frac{(15x + y)}{16}$$

B

$$\frac{(15x + y)}{(x+ y)}$$

C

$$\frac{(x + 15y)}{(x + y)}$$

D

$$\frac{(x + 15y)}{16}$$