Find the cost of 96 shares of Rs. 10 each at 34 discount, brokerage being 1/4 per share.

Let investment in each case be Rs. (143 x 117).

Income in 1st case = Rs.11143 x 143 x 117 = Rs. 1287.
Income in 2nd case = Rs.394×117 x 143 x 117= Rs. 1394.25

Clearly, 9 3/4% stock at 117 is better.

Michel earns Rs. 135 by investing Rs. 1620
To earn Rs. 8 how much he have to invest...?

= (8 x 1620)/135 = Rs. 96

Let the monthly salary of Shankar be = Rs.x
Amount invested on expenditure = 25% = x/4;
Remaning amount = 3x/4;
Amount invested on children education = 20% i.e = 3x/20;
Remaining amount = 3x/4 - 3x/20 = 3x/5;
Remaining amount invested in three different schemes i.e is 1/3(3x/5)
=> x/5 = 5600
Therefore x = 28000
Hence, Monthly salary of Shankar is Rs. 28,000.

Cash realised= Rs. (106.25 - 0.25)
                      = Rs. 106.

S.P of Rs. 5000 stock = Rs.156100*5000= Rs. 7800. 

Income from this stock = Rs.12100*5000 = Rs. 600.  

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

Therefore,  

x*890+7800-x*9108=600+70  

4x45+7800-x12=670⇔x=3600 

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

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

Suppose he buys each share for Rs. x.

Then, Rs.25*9100=x*1010 or x = Rs. 22.50.

Cost of each share = Rs. 22.50.

By investing Rs. 136, income obtained = Rs. 10.

By investing Rs. 6800, income obtained = Rs.1036×6800 = Rs. 500.

By selling Rs. 100 stock , cash realised = Rs.100-4-14=Rs.3834  

By selling Rs. 2400 stock, cash realised =Rs.3834*1100*2400 = Rs 2298.