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A man sells Rs.5000, 12 % stock at 156 and uinvests the proceeds parity in 8 % stock at 90 and 9 % stock at 108. He hereby increases his income by Rs. 70. How much of the proceeds were invested in each stock?

Correct Answer: 4200

Explanation:

S.P of Rs. 5000 stock =  R s . 156 100 * 5000 = Rs. 7800. 


 


Income from this stock =  R s . 12 100 * 5000  = Rs. 600.  


 


Let investment in 8 % stock be x and that in 9 % stock = (7800 - x).


 


Therefore,  


 


x * 8 90 + 7800 - x * 9 108 = 600 + 70   


 


4 x 45 + 7800 - x 12 = 670 x = 3600  


 


Therefore,  Money invested in 8 % stock at 90 = Rs. 3600.


 


Money invested in 9 % at 108 = Rs. (7800-3600) = Rs. 4200.


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