$A$ man bought $20$ shares of $Rs. 100$ at $4$ discount,the rate of dividend being $12 \%$. The rate of interest obtained is (in $\%$):

Jatin invested $Rs. 27260$ in buying $Rs. 100$ shares of a company at $Rs. 116$ each. If the company paid $16 \%$ dividend at the end of the year,find his income from the dividend (in $Rs.$).

Seema had $50$ preferred shares and $400$ common shares of par value $Rs. 100$ each. If the dividend declared on preferred shares is $10\%$ per annum and a semiannual dividend of $7.5\%$ is on common shares,find the annual dividend received by Seema (in $Rs.$).

$A$ man bought $Rs. 20000$ of $5\%$ stock at $90$ and sold it when its price rose to $Rs. 93 \frac{3}{4}$. Find out his gain percent.

Sonu invested $10 \%$ more than Mona. Mona invested $10 \%$ less than Raghu. If the total sum of their investment is $Rs. 5780$,how much amount did Raghu invest? (in $Rs.$)

$A$ company declared an annual dividend of $10 \%$. Find out the annual dividend of Ram owning $1500$ shares of the company of par value $Rs. 10$ each. (in $Rs.$)