Answer with Explanation:

Let the investment in 9% stock be Rs. x.

Then, investment in 10% stock = Rs. (9800 - x).

9/75 x x = 10/80 x (9800 - x) 

3x/25 = 9800 - x /8 

=> 24x = 9800 x 25 - 25x

=> 49x = 9800 x 25

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