Sakshi invests a part of Rs. 12,000 in 12% stock at Rs. 120 and the remainder in 15% stock at Rs. 125. If his total dividend per annum is Rs. 1320, how much does he invest in 12% stock at Rs. 120? Choose the correct choice from the following choices.
A) s. 4000 B) s. 4500 C) s. 5500 D) s. 6000 E) s. 6500
Let investment in 12% stock be Rs. x.   Then, investment in 15% stock = Rs. (12000 - x).   12/120 * x + 15/125 * (12000- x) = 1320   x/10 + 3/25(12000-x) = 1320   5x + 72000 - 6x = 1320 x 50   x = 6000.   Answer = s. 6000
<result>D</result>
Sakshi invests a part of Rs. 12,000 in 12% stock at Rs. 120 and the remainder in 15% stock at Rs. 125. If his total dividend per annum is Rs. 1320, how much does he invest in 12% stock at Rs. 120?