$67 \%$ of $801 - 231.17 = ? - 23 \%$ of $789$

The radius of a sphere is increased by $10 \%$. The surface area increases by

In Mumbai,$60 \%$ of the registered voters are $BJP$-supporters and the rest are Congress-supporters. In a mayoral race,if $75 \%$ of the registered voters who are $BJP$-supporters and $20 \%$ of the registered voters who are Congress-supporters are expected to vote for candidate $X$,what percent of the registered voters are expected to vote for candidate $X$?

Samar spends $52 \%$ of his monthly salary on household expenditure and $23 \%$ on miscellaneous expenditure. If he is left with $Rs. 4500$,what is his monthly salary?

An agent gets a commission of $2.5 \%$ on the sales of cloth. If on a certain day,he gets Rs. $12.50$ as commission,the cloth sold through him on that day is worth?

Two numbers are more than the third number by $20 \%$ and $80 \%$ respectively. The first number is what percent of the second number?