$A$ clerk received an annual salary of $Rs$ $3,660$ in the year $1975$. This was $20\%$ more than his salary in $1974$. What was his salary in $1974$?

If $A$'s salary is $30\%$ more than that of $B$,then by how much percent is $B$'s salary less than that of $A$ (in $\%$)?

In an election between two candidates,$60 \%$ of the voters cast their vote,out of which $4 \%$ of the votes were declared invalid. $A$ candidate received $7344$ votes,which were $75 \%$ of the total valid votes. Find the total number of votes enrolled in the election.

Ramesh loses $20 \%$ of his pocket money. After spending $25 \%$ of the remainder,he has $₹ 480$ left. What was his pocket money?

The price of rice is reduced by $2 \%$. How many kilograms of rice can now be bought for the money which was sufficient to buy $49 \text{ kg}$ of rice earlier?

In an examination,$37 \frac{1}{2} \%$ of the candidates were girls. If $75 \%$ of the boys and $62 \frac{1}{2} \%$ of the girls passed,and $342$ girls failed,find the number of boys who failed.