The average annual income (in Rs.) of certain agricultural workers is P and that of other workers is Q . The number of agricultural workers is 9 times that of other workers. Then the average monthly income (in Rs.) of all the workers is :

• A. (P + Q)/10
• B. (P + 9Q)/10
• C. 1/( P + Q)
• D. (9P + Q) / 10
• E. None of these