The population of a town increases by $5 \%$ annually. If its population in $2001$ was $138915$,what was it in $1998$?

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.

If the income of $R$ is $30 \%$ more than the income of $Q$ and the income of $Q$ is $20 \%$ more than the income of $P$,then the income of $R$ is how much percent more than the income of $P$ (in $\%$)?

What per cent of $\frac{2}{7}$ is $\frac{1}{35} ?$

$A$ man wills $40 \%$ of his wealth to his wife and the rest to his children. What percentage of the wealth willed to the wife do the children get?

If the price of gold increases by $30 \%$,find by how much the quantity of ornaments must be reduced so that the expenditure may remain the same as before?