Correct Answer: Option A
Let investment in 12% stock be Tk. x.
Then, investment in 15% stock = Tk. (12000 - x).
So, {(12/120) x x} + {(15/125) x (12000 - x)} = 1360.
=> x/10 + (3/25) x (12000 - x) = 1360.
=> 5x + 72000 - 6x = 1360 x 50
=> x = 4000.
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