Masood invests a part of Rs. 12000 in 12% stock at Rs. 120 and the remainder in 15% stock at Rs. 125. If his total dividend per annum is Rs. 1360, how much does he invest in 12% stock at Rs. 120?

• A. Rs. 4500
• B. Rs. 6000
• C. Rs. 5500
• D. Rs 4000