In a certain year, the average monthly income of a person was Rs. 3400. For the first eight months of the year, his average monthly income was Rs. 3160 and for the last five months , it was Rs. 4,120. His income in the eighth month of the year was:

• A. Rs. 3,160
• B. Rs. 5,080
• C. Rs. 15,520
• D. Rs. 5,520